I have a stock th350 with a b&m shift kit and is in great shape but i am wondering if i should build it up for my engine. What do you guys think?

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1989 Camaro RS, 355 engine, 4 bolt block, 11.5:1 compression, 305 heads--ported, polished, milled, 3-angle valve job, 2.02 intake and 1.60 exhaust valves, Edelbrock rpm valve springs, 1.5 rockers--, Keith Black pistons, solid lifter cam, Edelbrock RPM intake, 750 cfm Holley, Holley Red electric fuel pump, MSD distributor, Turbo 350 w/B&M Shift kit, 3.73 Richmond Gears, Hooker headers, Flowmaster exhaust



My Pontiac's (my babies)
1972 Pontiac LeMans, 2 Door, red with tan top, 350 V-8, Edelbrock Perf. Intake, Rochester Carb, Turbo 350 trans with B&M shift kit, Dual Exhaust

1968 Pontiac GTO, Rust free body, White with Black Interior, Original 4-Speed Car, 400 V-8 engine, Hideaway Headlights, Positraction Rearend

 

Mine is still surviving. The weak link is the intermediate sprag (overrunning clutch). It stops the direct drum when shifting from 1-2. It can explode and take out a few parts inside the tranny. Even a stock engine can break the sprag is misused.

I'm upgrading to a TH400 just for a stronger transmission and a transbrake this winter.

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.447 altitude corrected to 10.99
Best MPH on a time slip: 119.42 altitude corrected to 124.86
Altitude corrected rear wheel HP: 493
Best 60 foot: 1.586

Racing at 3500 feet elevation with a typical race day over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

Yeah, i have a turbo 400 that needs a part or two but i don't know if there would be any HP loss due to it being a heavier duty transmission, granted I would get a stronger tranny, but i would have to get another conversion kit and more than likely another driveshaft.

 

The TH400 takes about 15 more HP to turn plus weighs about 15 pounds more. A TH350 will let you run quicker but the TH400 is better built.

I built my TH350 a couple of years ago and just finished building the TH400 last week. I like the internal design of the TH400 much better.

 

Stephen, I don't understand why you don't just go 'Glide.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4, 2300 stall TC. Ported World 305 heads, Crane PowerMax 2050 cam. ZZ3/4 intake, oil pump, pan & baffle. Accel HEI SuperCoil & module. Hooker 2055 headers, 3" Catco cat & 3" catback w/dual-opposite Flowmaster 80. 2.93 limited slip. Spohn SFCs waiting to be installed. AMSOIL syn lubes bumper-to-bumper. Daily year-round driver. Best ET, speed TBD...
57 Bel Air, my 1st car. '66 396, 9.7:1 forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 700 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

 

The extra cost of having to buy another shifter. Canadian exchange rate sucks right now and I don't feel the car is light enough yet to really take the full advantage from a glide.

[This message has been edited by Stephen 87 IROC (edited December 13, 2001).]

 

I have a TH350 in my 70 Nova,behind a 454.
It's manual-only,with 3000 Stall TC and the usual added clutches/steels.So far it's holding up very well,street driven and occasional drag race.About 550HP/500FT/LBs.
(Running hi-elevens)
I do plan on upgrading to a TH400 when it goes, though.
-Rich-

 

Stephen is right on the money...

If all you have is a small block, then the 350 is plenty even with stock internals. You have nothing to worry about except making sure it's built right.

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"So many Mustangs, so little time..."
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