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Just a general question, if I was to swap out the TH350 in my car now for another one, is there anything in particular that I need in order to have it fit or will any 350 fit? I found one that looks to be in good condition, the owner said its out of a 82 corvette and he's asking $200 for it.
The tranny that came with my car was dangerously low on fluid when I bought the car and it does shift very hard between gears. I think the po mentioned that the car was sitting for a long time. With all the engine upgrades I feel that maybe the tranny is a weak point now I should either get it rebuilt or swap in another 350?
If you're going to trouble to change transmissions; suggest one with overdrive e.g. 2004R or 700R4
AFAIK, 1982 Corvette auto trans was overdrive 700R4
Would the torque stall converter swap over to a 700r4? Also are the turbo3500 and 700R4 the same size in the sense that 350 could be removed and the 700r4 installed or does it involve a bunch of work to get it to fit?>?
Would the torque stall converter swap over to a 700r4? Also are the turbo3500 and 700R4 the same size in the sense that 350 could be removed and the 700r4 installed or does it involve a bunch of work to get it to fit?>?
2004r is same size as corvette th 350 and 400. 700r about 3 inches longer. What you doing with a t350 in a 68 anyway?
The car came like that when I bought it. From what the PO told me, the car originally had a 427 with a 4 speed but at some point it was swapped out for a SB350 and a TH350 3 speed. I am only considering getting it replaced since it leaks and there's jolts when it shifts between gears. I may first just take it to a tranny shop and get it diagnosed prior to dropping cash to get another tranny.
I guess that could be it as well. I did have the fluid replaced but none of the other items listed. It might just need some tlc, but it would be nice to know once diagnosed that the tranny is in good working order to send the new power to the tires.
There are 3 different TH350's all dealing with tailshaft length. Short is 4x4, middle one is the "normal" that fits most everything, and there was a long one they used in 2wd pickups. Plus the 350C that had a lockup convertor.
With a rough shifts, check the modulator is good- and getting the proper vacuum. And that the kickdown cable is adjusted correctly. 350's shift by a combination of modulator signal and road speed sensed by the governor. The only time the cable comes into play is for a forced 3-2 or 2-1 downshift. A shift kit, if it has one, changes the line pressure and the shift points and feel by swapping springs in the valve body and line pressure control. Usually, they also change the governor springs and open some of the holes in the spacer plate between the case and valve body.
Not quite as strong as a TH400, but the 350 can be built to take some abuse. I built one years ago for a guy that was racing a 66 GTO with a stout 455. He'd broken 4 speeds, rear ends, u-joints and just about everything else- he even twisted a 4 speed input shaft. Never did break that 350.
There are 3 different TH350's all dealing with tailshaft length. Short is 4x4, middle one is the "normal" that fits most everything, and there was a long one they used in 2wd pickups. Plus the 350C that had a lockup convertor.
With a rough shifts, check the modulator is good- and getting the proper vacuum. And that the kickdown cable is adjusted correctly. 350's shift by a combination of modulator signal and road speed sensed by the governor. The only time the cable comes into play is for a forced 3-2 or 2-1 downshift. A shift kit, if it has one, changes the line pressure and the shift points and feel by swapping springs in the valve body and line pressure control. Usually, they also change the governor springs and open some of the holes in the spacer plate between the case and valve body.
Not quite as strong as a TH400, but the 350 can be built to take some abuse. I built one years ago for a guy that was racing a 66 GTO with a stout 455. He'd broken 4 speeds, rear ends, u-joints and just about everything else- he even twisted a 4 speed input shaft. Never did break that 350.
The pass car TH350 had a 6" tailshaft as stated.....as did a LOT of pickups......BUT! Some 1/2 ton 305's and 6 cylinders had a 9" tailshaft.........
The reason I know this is that in the early 90's a 9" tailshaft trans was a DIRECT bolt in to swap a V8 in a 4cyl S-10......you could even use the stock driveshaft
The TH350C was a lockup trans as stated.......they can be used without the lockup function.
I found one that looks to be in good condition, the owner said its out of a 82 corvette and he's asking $200 for it.
The tranny that came with my car was dangerously low on fluid when I bought the car and it does shift very hard between gears. I think the po mentioned that the car was sitting for a long time. With all the engine upgrades I feel that maybe the tranny is a weak point now I should either get it rebuilt or swap in another 350?
What do you guys think?
I tend to not buy things from people that don't know what they are talking about. (NO th350 in a 82)
It's really pretty easy to tell the health of an auto tranny. You can compare the trannies fluid to brand new stuff right out of the bottle. but the best way is to pull the pan off and see what's in it. chunks of metal and shavings is a sign of severe abuse generally requiring a modified valve body to be able to destroy the hard parts. Fine aluminum/metal sediment is a sign of normal ware a tear as is black and brown clutch dust.
Your instant hard shifts could be a simple as someone installing a shift kit which is generally a thin steel plate that fits between the valve body and tranny main body. then the installer went with the springs...…… for the firmest shift. You are generally given several choices in each kit. You could buy another shift improver kit and go with a milder setup. Full on race rebuilds use modified valve bodies, extra steels and clutches, Kevlar materials...………….
TH350 and TH200 are a direct fit. TH700R4 is a different TC, crossmember, and drive line length.
I've put a lot of money into TH350's and had them just fill the pan with busted chunks behind a hot rodded 355 ci in my vette. If you have money to spend and love automatics the 800+ HP 700R4's with a the 2.84 first gear are the way to go. I ran one for many years with a 3800 stall and lots of 427 HP with 12 inch slicks.
You can't tell anything by looking at a pic of it. He could have just cleaned and painted it. Why not just keep driving with your tranny and see how it goes. It may be fine.
Thanks for those replies. I guess I will hold off on buying anything just yet. The tranny does need some attention since its leaving black spots on the driveway and the wife aint too happy about that. I'll take it in for a diagnosis and if its just minor stuff then I would be fine with keeping the tranny I have but if its going to be a significant repair then I will need to source another tranny.
07-23-2019, 04:20 PM
Are all Turbo 350 the same?
