Killed my 4th 4L60, I am going with the T/H 350. It has lasted a couple hundred 9.90 runs in my 68 SS, with a small block. I now have a Powerglide in there and now is going faster.

I want to know how to get the troque Arm to mount up and How to get the Speedo to work. I read somewhere that all I have to change is to the Larger Tailshaft and use a New Speed Sensor and Reluctor wheel. Has anyone done this?

I also want to keep the stock shift for the Stock Look. I have got the the 11s Keeping the Stock Look of the TA.

Please give me your input on this install.

~Gary

 

You'll need a torque arm that mounts to its own crossmember instead of the tranny such as a Sphon. I believe a 9" (mid-length) TH350 tailshaft will put you at the same tranny length now. On a TH400 you can use the speed sensor and reluctor but, I'm not sure what to do on a TH350. I believe it might be different. Might search in the Drag Racing Forum... seems like I got a lot of info over there on my TH400 swap.

 

I just finished this swap.

For the speedo, I tapped the ABS wheel sensor and re-flashed the computer to tell it I have a 1.15 gear ratio on the speedo side.

My tranny builder had a "Fits-all" kit to adapt the 6" tailhousing and make the mount line up with the stock one. I promptly stripped the aluminum tranny mount holes and heli-coiled them, but all is well now.

I am not sure I am happy with my torque arm choice - a MAC. It "moves the immediate center because it is shorter," they stated on the phone, but I am no chasis expert. I do know I could not hook to save my life last night (1.96 - 60') when I got 1.75-1.79 on a stock torque arm!

I am making a post about torque arm geometry also...

Click "Moser" in my sig to see pics of the Tranny and shifter (big page, sorry).

------------------
-- Tim
http://tim.mindriot.net

Mods: LT1 Edit, TB Bypass, CAI, 58mm TB, 30# Accel Injectors, GMS MAF, LT4KM, !Cat, !Front Sway Bar, !Rear Sway Bar, 1LE Elbow, Meziere Water Pump, March Pulleys, Aluminum Driveshaft ('88 Z28), 3" cutout, BTE 3400 stall, TH350 with TCI Transbrake, B&M Pro Ratchet, Moser 12-bolt with 33 splines & spool, Dynatech headers, Homemade Y-Pipe, Edelbrock "cat"-back, XE230/236 cam - click to hear!, CC 1.6RR's and guides, Nittos, MSD 6 Digital+, Accel Super Coil, Hurst LineLock, Eibach Drag Launch Springs, KYB adj struts, CE Drag Shocks, Lakewood LCA's, Biondo Mega 75 Delay Box, 3.73
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Best Times: 8.10 1/8th mile, 1.750 60', 85 MPH
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Dyno Tuned to 353 RWHP - no new times on that, new tranny, etc. yet!