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Originally Posted by xtinc
Hi all,
 I'm new to the board and Chevy trucks. I recently purchased a '67 LWB with a 350/4sp. It's a little ruff, but overall in good shape. I'm not a big fan of the 4sp trans currently installed and want to swap it out with a TH350 Auto. I plan on purchasing a Lokar floor shifter to go with the trans.
Hoping someone could help me with a few questions
1. What size transmission shaft should I get short or long?
2. Can I use my current drive shaft?
3. Besides an auto flywheel, auto trans mount, Lokar shifter, transcooler, and fluid lines, will I need anything else?
Thanks in advance for the help.
Tom |
Welcome Tom.
I'm not sure about which length of trans you need. I've never swapped a 4 speed to an auto, just 3 speeds. You can measure the length of your current trans and compare to the lengths of auto trannys to see how it compares.
This I know for sure though....
You're also going to need an automatic tranny crossmember. You'll notice the old 4 speed has a riveted in crossmember right underneath the bellhousing. That all has to be removed and the auto crossmember goes under the rear of the auto tranny. The bolt holes are already in the frame. It's will take 8 bolts and nuts to hold it in to the frame.
If you starter is the original type which bolts to the standard bellhousing with 3 bolts, you'll need an automatic trans type of starter that bolts to the block as well as the 2 special long starter bolts to go with it.
You'll need new bolts for the auto trans flexplate. The original standard flywheel is much thicker and takes longer bolts than the auto one does.
You'll need the 3 special bolts that hold the torque converter to the flexplate.
Be sure and remove the old standard trans pilot bushing out of the center of the crankshaft. The auto trans does not use one and if you leave it in place, it will not allow the torque converter to fully seat up to the engine.