Th425 transaxle. some simple machine work would do the trick.

Th425 transaxle. If you can find a 66 or 67 Toro, they have what is called a switch pitch version of the TH400 trans, (called the TH425 in Toros). The starter mount would have to be lopped off and even then I think the fit is too tight. The THM425 (and later 325) is a 3-speed automatic gearbox designed and released by GM. I have a GMC 3500 truck with an LSD and I can really feel how it scrubs around corners. Nice! May 27, 2020 · Yes, the LS1 will bolt to a TH425. Front wheel drive vehicles. Not sure if it's quasi-integrated with the oil pan or not. Oct 28, 2024 · Get the Best Performance with Trans Go Reprogramming Kit TH425 425-1 parts at JEGS. Will this transmission bolt up to my Olds 403 or are the bolt patterns different from Cadillac to Olds or vice/versa? Apr 17, 2022 · The Th-425 is the transaxle derived from the TH-400 rear wheel drive components and is quite robust. There's never been anything in between the Porsches/Audis and serious race boxes like Hewland. Jan 5, 2024 · TH 425 automatic transmission rebuilding kit will fit all Turbo Hydramatic 425 transmissions used from 1966 - 1978. 1966-1978 Oldsmobile Toronado TH425 (Turbo-HydraMatic 425) Stock Capacity Transmission Pan (Black Powder Coat Finish) $485. cowan1984 Member . Bell housing adapter plate is used but modifications are needed to make it work. And if the second rebuilder could have tested it, he would have seen the issue and saved the time and energy of installing, then removing the transmission. There is a company that made/makes some kind of shorty header for the Olds in a motor home which will work for you . A 4-speed transaxle which replaced the 125, was created for the 1985–1986 GM C platform (FWD)/GM H platform (FWD) cars, the Turbo-Hydramatic 440-T4. This PML pan fits front wheel drive GM cars with the TH425 transaxle transmission. Now, here's some of my thoughts on this subject. It just might be the coolest front-wheel-drive vehicle ever, and yes, we're including the EM Aug 6, 2022 · Instead, the Hy-Vo chain in the TH425 transfers power from the torque converter to a reversed TH400 gearset, so I’d either need a second transmission pointing rearwards or some complicated back-and-forth takeoff from the far forward portion of the Unitized Power Package. The Olds 350 has it over the Chev 350 like a tent. com Dec 5, 2023 · NEW master rebuild kit for the 1966-1978 TH425. Find many great new & used options and get the best deals for Th425 Master Rebuild Kit Th-425 Transmission Transaxle Overhaul GM Cadillac Olds at the best online prices at eBay! Free shipping for many products! Jul 12, 2012 · Well, first I have to say that anything is possible. When hooking up a Caddy to a Chevy or GMC converter, you have to keep in mind that the bolt pattern on the converter must match the hole pattern on the flex plate. The transmission is the heart of your car. Different Brand/Model motorhome gear ratio Info>> FRONT END Final drive kits>> Jim Kanomata GMC Parts and Services Links found here>> INDEX LIST Transaxle Engineering is the leading provider for all specialty transaxle needs. I'm using a TH425 transaxle from a 73 el Dorado with a 3000 stall convertor. 10 ratio) for the TH425. It would not take much to turn the output to a standard splined shaft…. PML Transmission Pan Features: Sand-cast aluminum with raised fins Nov 3, 2005 · A couple things to consider. If it ain't in the front, it will be in the middle, not the back, with a reversed THM325-4L, or a TH425, short drive shaft, and a decoupled quick change (flipped ring gear) solid axle, so the left axle tube just clears the blower pulley. definitely not a weekend project. Jun 13, 2004 · I am thinking I am going to use a TH-425 automatic transmission from an oldsmobile toranado because I have heard that it is nearly bulletproof. I've seen a car where a whole Northstar engine and transaxle have been used, but the car was converted to a tube frame. 73 ratio was the most common. Jun 28, 2017 · 425/45/55 transaxle questions Jump to Latest 2K views 1 reply 1 participant last post by kencombs Jun 28, 2017 I probably have some photos of the car but it would take some time to find them. These applications include. That leaves the chain drive on the input side, and the differential on the output side, as potential trouble-spots. The FWD GMC motorhomes with the Olds 455 (or 403 after 1976) Olds and TH425 had many ratios. THe next problem is if you want headers, the transaxle is in way of std. It will bolt up to the same transaxle the big block did, or you could get the complete package from an eighties Toronado or Eldorado or Seville. What is not commonly apparent is the complexity of the design and engineering of the chain and the drive and driven sprockets used to transfer torque. So, decide which one you want and start to source the adapter. Jun 20, 2023 · Porsche Boxter S Transaxle (decent, but might not handle power) (MT/AT) Porsche G50 - too rich for my blood, and i'm not tracking the car (10k+) (MT) TH425 - Bullet proof and may be a decent choice, but hard to adapt, heavy, raises engine, only 3 gear; Any other options you guys know of? May 2, 2009 · <<<It's a Model A closed cab pickup, so there ain't much of a real bed. This includes: 1966-78 Oldsmobile Toronado; 1967-78 Cadillac Eldorado; This pan features raised fins to help with cooling and a boss that can be drilled for a temperature sensor. It will be easier to locate than a TH425, cost less over all without the machining, and perhaps even leave a little more room for a twin turbo setup. Problem is oil pan to clear axle shaft . -produced front-wheel drive automobile since the demise of the Cord 810/812 in 1937. If anyone can tell me any specs about actual capabilities please let me know. Apr 17, 2022 · The Th-425 is the transaxle derived from the TH-400 rear wheel drive components and is quite robust. Get the Best Performance with Trans Go Valve Body Shift Kit TH425 SK425 parts at JEGS. Shop Now at the Guaranteed Lowest Price! 23400 Transmission And Transaxle Plug Sonnax Transmission parts for GM TH425 applications. However, neither option will be as inexpensive as a $300 to $400 boneyard Audi 016 manual box and a $1200 adapter for Audi to Ford. Virtually no internal parts were shared with the 125, and overdrive was achieved by departing radically from the standard single Simpson compound planetary gearset 's common sungear layout. The Toronado/Eldorado transaxle is a TH425 (3 spd based on the TH400); the TH325 (3 spd based on the TH350) and the TH325-4L (also based on the TH350. 0 Members and 1 Guest are viewing this topic. A 400 can be built to take an insane amount of power. Turbo-Hydramatic 425 (TH425 or THM 425, [1] later 325) was an automatic transmission developed and produced by General Motors. com Jun 26, 2006 · The engine and transaxle on a Corvair are stressed parts of the rear suspension the rear suspension lower control arms bolt to the transaxle case. Jul 8, 2019 · TH425 Transmission- suggested maintenance with engine out. Oct 18, 2013 · I knew the Toro transaxle obtained addition gearing by the chain drive change. Show all items you need Feb 19, 2021 · GMC’s revolutionary motorhome used the TH425 transaxle from GM’s personal luxury cars like the Olds Toronado and Cadillac Eldorado. GM TH425 Transaxle Stock Capacity Part Number 7873; For 1960s and 1970s Eldorado, Toronado, some GM Motorhomes and similar. I have done this in my Fiero Base Countach kitcar. Nov 7, 2011 · If you want the heavy duty Toronado transaxle for reliability, use the Olds 350 engine with it. Your late Vette rear axle is fed by a standard driveshaft and the latest Vettes with the transaxle is another matter entirely. With that I can utilize the th425 starter. We offer a wide range of transaxles and applications from offroad, street and vintage race cars. Mar 23, 2019 · TH425 (3 speed automatic) TH325 (3 speed automatic) TH325-4L (4 speed automatic OD) Corvair/Tempest (3 & 4 speed manual, 2 speed automatic) Corvette C5/C6/C7 (6 speed T56, 6 speed T6060, 7 speed T6070, 4 speed 4L60, 6 speed 6L80, 8 speed 8L90) Jun 15, 2016 · That means it's got an Oldsmobile 455 with a front-wheel-drive TH425 transaxle like an Olds Toronado. The independent rear suspension features custom trailing arms and spindles to handle the half-shafts from the TH425 transaxle, and just dig the custom oil pan that has a cut-out for one of the shafts running right through it. Nice! Nov 9, 2009 · The Isuzu flywheel interferes with the bell on the transaxle as does the starter. S. This kit contains all clutches and steel plates. Also, the transmission is designed very similar to how allot of FWD trannys in that it "U-turns" and runs along side the engine block. BTW, being in Europe you have the Renault UN1 which seems to be popular in GT40 kit builds. Nov 7, 2011 · any Buick Olds Pontiac Cadillac all bolt up, Chev is the odd ball and would require adapter. Dec 6, 2020 · The GMC motorhome community has developed a posi unit and steeper gear sets (up to 4. Manny Trovao, Owner Manny’s Transmission / Power Drive San Jose, California 408-937-1583 mannystrans@gmail. ) Jun 20, 2008 · The TH425/325 definitely doesn't require a computer. I have been approached by other non-GM people. Overhaul rebuild kit for the GM TH425 automatic transmission – Stock, heavy duty, or high performance Application specifics:</ - OPT-TH425-RB NOTE: OPT uses javascript to enhance and secure your online experience. Jan 27, 2013 · TH425 = 1966 to 1978 (used on Cadillac Eldorado and Oldsmobile Toronado only) TH325 = 1979 to 1981 (used on Cadillac Eldorado and 1980-generation Seville, and the Oldsmobile Toronado and Buick Riviera) TH325-4L = 1982 to 1985 (see TH325 for usage) TH125 = 1980 to 1981 TH125C = 1982 to 1986 TH440T4 transaxle = 1985 to 1986 (used with TH125C) Apr 29, 2024 · It was a massive personal luxury coupe with a big V8 powering a chain-drive called Hy-Vo, which delivered the power to a TH425 transaxle. They use the old Cadillac/Olds TH425 transaxle. 08 gear. First, the TH-425 weighs 400 lbs and it's little brother the TH-325 weighs 300lbs just by themselves. I'm told the '68-newer differential is stronger than the '66--'67. Mar 20, 2012 · This has been the age old dilema, a transaxle for a V8. The TH425 is the strongest of them. Tech Resources Browse All Articles, Guides & Videos Jul 28, 2014 · The early Eldorado/Toronado th425 transmission is based around the th400 and was designed to be a rather robust unit. Now I see why these didn't break. Stellantis Media photo. The later 325 (79-81) and 325-4L (82-85) were light/medium duty units based around the Metric 200/2004r architecture. May 22, 2011 · Limited Slip in an FWD car may not be a good idea. Nov 30, 2014 · The transmission internals of the TH425 are exceedingly similar to the internals of the rear-drive TH400. It was replaced(not renamed) by the TH-325 in 1978-up model cars. 99 NEW master rebuild kit for Mar 18, 2010 · Th425 The 2. cleaned up the transaxle today, couldn't resist taking the cover off. It took 2 years to do it and it is all custom. Advertisement Jun 20, 2007 · It connects to the ECM for OBD II dianostics. Post by bluecab » Fri Apr 22, 2011 10:05 pm . Sell TH425 Master Rebuild Kit TH-425 Transmission Transaxle Overhaul GM Cadillac Olds in Salem, Oregon, United States, for US $219. Started on: 01-20-2008 12:00 PM: Replies: 7 : Last post by: big block fiero on 01-21-2008 11:05 PM: Jan 20th, 2008. Also if anyone knows and other transaxle that is a stronger set up that is readily available please let me know. Nov 1, 2004 · Whereas it once was confined to a few early front-wheel-drive automatics like the TH425 and 325 units, the drive chain is now a huge-volume replacement part, used daily by repair shops worldwide. I don't know that this transaxle would be suitable for this kind of application. The Oldsmobile Toronado is a personal luxury car manufactured and marketed by the Oldsmobile division of General Motors from 1966 to 1992 over four generations. If I were doing at again, I would use some other lighter, smaller engine to mate up to the Toro transaxle, such as a SB Chevy. Flex Plates, Flywheels, Etc. GM 6T70 Transmission Master Rebuild Kit 6T75 Transaxle Overhaul May 7, 2019 · Firstly, using one requires a second TH425 output, to act as a donor for the governor drive gear. Jan 15, 2012 · Anyway, point of all this: The Legend transaxle is similar to the TH425 imaged above. I built a few units for Dodge Neon SRT-4, a couple for old RWD English imports, I even build an lsd for the classic 73-78 front wheel drive GMC motorhomes that weigh 12,000#. . Mar 14, 2013 · The Porsche transaxle will probably be the way to go. Chrysler LH transaxle. 74 first gear, but there are other aspects that would reduce the torque capacity. some simple machine work would do the trick. Feb 26, 2022 · Learn a few facts about my favorite transmissions of all time, the Turbo-Hydramatic (THM) 400 / 425 produced by General Motors. Get the grinder out to cut away the trans casing for the flexplate teeth to clear. The transmission sits behind the engine, and the differential plugs into it and bolts to the side of the engine. The THM425 was originally developed for the Oldsmobile Toronado in 1966. Indeed, the GMC motorhomes were powered by the same powertrains as the Oldsmobiles, with either 403 or 455 V-8s providing the motivation. Jun 6, 2024 · Compare it to the Turbo Hydramatic 125 FWD "X" cars (Chevy Citation) and you have a feel for how rapidly FWD design and engineering progressed at GM and evolved to the "transaxle "concept from the classic "differential axle" of the "Unitized Power Package". (As it’s a later-production model it should be the 403 in this case. A towing package equipped car had a lower 3. Jun 15, 2016 · That means it's got an Oldsmobile 455 with a front-wheel-drive TH425 transaxle like an Olds Toronado. It was replaced (not renamed) by the TH-325 in 1978-up model cars. What ring and pinion ratio was used the "motorhome" unit since it used the non 1:1 ratio chain and gear setup? The 1966-67 units were 3. TH425 Finned Aluminum Oil Pan Powder-coated black with polished fins or full polish Fits ’78-older Eldorado, GMC Motorhome, and Tornado FWD transmissions. The Turbo 425 differential bolts to what would normally be called the tailstock of the trans. Jul 7, 2021 · New guy here. It just might be the coolest front-wheel-drive vehicle ever, and yes, we're including the EM If it's running the '80's transaxle it's a TH325 if it's a 3-speed and a 325-4L if it's a 4-speed. They are not cheap. The intent of an LSD is to provide traction in cases where one wheel might slip, but it also resists the differential action in normal use, and FWD cars really experience a significant differential action when cornering. It was weird and wild, and I love it. 23400 Transmission And Transaxle Plug Set $13. The TH425 was used in the GMC motor homes, and from what I understand an aftermarket limited slip carrier of some sort was developed for it. If you are running the transaxle from the '70's Toronado that donated the 455, then it's a TH425 transaxle. The THM425 was a derivative of the THM400; most parts directly interchange and some others will interchange with minor modifications. The structure of the THM425 is based on the THM400; most spare parts in these gearboxes are directly interchangeable and some others can be adjusted with the help of slight modifications. 21 gearing but was a planetary system. 00. Nov 2, 2023 · I'm currently looking at a th425 transmission for my 1978 Toronado. Harvesting that portion of the output is a very difficult machining process to do properly, as it, and the turned-down shaft that it must be interference-fit to, are both hardened steel. Feb 28, 2021 · Now, if the first rebuilder had a test bench for the TH425, he might have noticed low line pressure when he rebuilt that transmission and saved me the tranny problems from the start. Most early electronic transmissions use the "-E" designator to differentiate them from their non-electronic cousins, but this has been dropped on transmissions with no mechanical version like the new GM 6L transmission. Previous topic - Next topic. They have the 2. Started by toukow, July 08, 2019, 10:30:28 PM. It's from a 1978 El Dorado. It fired first try and has really added a huge amount of torque in the low end. bolt on headers. The Toronado was noted for its transaxle version of GM's Turbo-Hydramatic transmission, making it the first U. It was a complete kit with great instructions. Visit the transaxle forum on GT40S. Rebuilt THM425 Transmission Rugged and Reliable - T he Turbo-Hydramatic 425 was an automatic transmission developed and produced by General Motors from 1966 to 1978. Sep 7, 2009 · TH425 specs needed by cowan1984. May 7, 2019 · The output of the TH425 is a short splined shaft ( maybe 3 inches ) that fits into a splined female pocket in the differential. com Jun 2, 2010 · lonestranger wrote: I would suggest you consider using either the 500 Cad Eldorado engine/transmission rather than the Olds engine package, as the Eldo is quite a bit lighter than the Olds (in fact if you use the edelbrock aluminum intake on the Cad motor, it weighs just slightly more than a small block chevrolet - but makes 500 lbs of torque to start with!! - just a thought). Mar 8, 2011 · Th425 chain pic. I recently installed a Holley Sniper units on my mid engine V8 Corvair. It is a much weaker transaxle based off the light duty TH-200 rear wheel drive components. This includes variable pitch and non variable pitch units. It is going to be a show rod, regardless of where the engine ends up. 99. Mar 25, 2013 · I build a unit for all GM FWD yransmissions, auto and manual. The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics, still based on the Turbo-Hydramatic design. As the 1966-78 Oldsmobile Toronado/ TH425 transmission specialists in NJ, we have the experience and expertise to provide transmission repair, transmission replacements and transmission rebuilds for any number of 1966-78 Oldsmobile Toronado/ TH425 car models. I have a line on a decent 4bt. tjfeg raysm xxbr nxxhd fkqjweq sdqaywkx vzadq zuitt amlq rex