Th350 behind 6.2
 

Is there anyway to put a TH350 behind a 6.2? Ive got a 73 Th350 and Np203 given to me out of a 73 K5 that had a 350 gasser thats seized and was wondering if i could run a 6.2 with it. Its gonna be used in a off road only truck so milage doesnt bother me. Thanks Dave

How much torque does the 6.2 have and how much abuse will it take

I actually have a 6.2 with a th350 behind it and it works pretty good,it is hard to get to shift on its own,I had to adjust the modualter alot till it shifted on its own,really strong and actually I still get like 20 to the gallon so even if u did take it on the raod as a dail driver or somthing u'd be doin pretty good

What torque converter would i have to use in the th350? Would one work out of a th400? I would probly be shifting it manually anyways so shifting on its own wont be too much of a big deal.

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They had roughly 130 to 140 ft lbs of torque. We used to have one in a 2wd suburban and beat the daylights out of it and we sold it at 400k miles on it and the new owner is still driving it. wish we woulda kept it.

sorry to kinda jack your thread but would a 6.2 get better milage not using od because i've got a k5 w/ 6.2 & 700r4 and i now get like 12ish. or is it just because im tryin to push a 4400 pound vehicle down the road at 70 mphs with 35s and 3.73 gears? because i drove the same amount of miles to a different place and got 20 mpgs

The big tires are killing you mileage and power.

yea i know that thats why it wont be too long before it gets overhauled

86k5 the best thing would be to re gear your axles into a more suitable gearing to turn those 33s.

I'm not sure about tourqe converters,the guy who I bought the truck from just put the th350 one in there and it works pretty decent,it won't do a burnout on dry tar,but ofcourse the only 6.2 diesel I haave seen do that are ones with bad back breaks or manuals in them,I'd say just go with a low stall tourqe converter and such and it should work great

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lol and yea my truck got better mileage with the 700r4 in it,it generally got 25 to the gallon and that was with a really really shitty 700r4,now with the turbo 350 I getlike 20 on the highway,I'd defnatley say ur tires are like serious power robbers,like drivein through a sand pit with a fully loaded bobcat trailer or somthing

but if you got the choice go for a turbo 400. no replacement for the strength they got. putting a turbo 350 behind a high torque and big wheeled 6.2 is like putting a 4L65E behind a 6.5 turbo in a 3/4 ton truck. it might work but your at its limit.

it will work with a stock tc but iff your muddin than get a low stall beefy tc

I would go with a turbo 400 but tryin to find one around here is like next to possible and if you do they are really expensive and usually toasted. the reason i wanna use the 350 is bc i can have this one for free!!! which is really nice. That and i like the full time 4x4 i have yet to find a 400 around here with a 203 attached. im not expecting a race truck just something i can go out trail riding and go occasionally light field mudding. I would be running a console shifter in it so i can control the shift speeds and add a shift kit to it. Unless someone has a turbo 400 and 203 they wanna sell im probly gonna try and mate the 6.2 to the 350. How long do you think it would last? specially since im planning on turboing it. I have the engine mocked up for the twins pushin about 8-10 psi of boost

no need for twins. just take manifolds off a 6.5 and the turbo and you will be pushing 8-10 psi right there. the th350 should be fine with a shift kit.

I know theres no need for twins but i want it to be something different, and being stuck in the middle of farm land we have farm equipment junkyards i ended up getting turbos off of a couple old international combines dont remember what model they were identical though.. And with the 350 trans i wouldnt just put it in stock and for get about things like a deep pan and heavy duty trans-cooler and a shift kit. As for the torque converter i tried fonding the lowest stall possible but then ran across the problem that a diesel has a larger bolt pattern than a gas converter. do you guys think it would be okay to drill flexplate/ flywheel whatever gm calls it for the smaller gas converter?

no problem with being different just try not to blow it up:pca1: i would think about some mechanical wastegates. as far as flexplates i dont know a whole lot about them.

Yeah thats very true on not trying to blow it up. I plan on adding a stud girdle and arp head studs. I seen somewhere online here where someone redrilled a 6.2 diesel flexplate to bolt the smaller gas torque converter to but it eventually ended up elongating the holes and destroyed itself. I was told the turbo 350 and turbo400 torque conveters were interchangable so maybe if i find a diesel 400 TC it'll bolt in im hoping :humm:

studs and a girdle should hold about 15 psi of boost safetly. yeah i dont think drilling holes in a flex plate is smart. half of the flexplate is already drilled out anyway.

th350's and th400's use the same converter so you could use the th350 with the stock diesel th400 converter... then its the correct pattern for flexplate and the lower stall.:pca1:

I have seen th350's survive stock bigblock trucks ok so shouldnt be problem as log as you arent doing stupid stuff like burnouts on pavement or drive to reverse drive to reverse real quick while on the throttle

Well im glad someone confirms about the 350 and 400 using the same converter. Im tryin to rely on my dad who's getting older and hasnt work on older chevy's in a while. His memory aint the greatest so thanks guys for answering all my questions.

Yeah no stupid stuff here i learned at a early age breaking stuff costs more money than its worth for the few seconds of fun i had doin it. That and i dont think the 6.2 would have enough power to turn all 4 over bein full time 4X4 on pavement.

Well now i guess i gotta go clean this guys garage out to get the tranny and stuff out. i can have it aslong as i clean up his garage. Then its gonna be the fun part of mounting it in my truck

i would really recomend not using a 203 case, they are poo and the fulltime 4wheel will get annoying quickly, trust me ;)

i don't see how a stock 6.2 would hurt a th350 being a 350 v8 has more power and nearly the same torque...