First Generation Firebird (1967, 1968, 1969)

First Generation Firebird (1967, 1968, 1969)

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You are here: Home / FAQs / Converting from Powerglide to TH350

Converting from Powerglide to TH350

By admn Jan 20 0

Q: Converting from Powerglide to TH350

I want to convert from Powerglide to TH350.

1. For street, non race applications, is the 3:32 to 1 rear end a good choice? My car really suffers from lack of low end power.

2. Is it true that I just need to change from a type 2 to type 3 carrier. I don’t need to change the axle assembly?

3. Since I’m changing to the TH350 and a type 3 carrier, can use my existing drive shaft?

4. Where can I get a 3 speed console shifter? Do I really need to change this as it just another detent position.?

A: 1. SInce you are changing to a TH350 you’ll be gaining an extra gear. Both the PG and TH350 have a 1:1 final ratio but the TH350 has the benifit of a lower first gear. The 3:32 gear is a good comprimise between performance and econimy. You will notice a big difference.

2. No. The existing rear-end will work great if you keep the gear set you have.

3: The TH350 is a DIRECT swap for a PG. the only thing that you need to change to make it totally correct is the detent in the shifter. But, it isn’t necessary. Some have just used a file to add a extra detent for the extra gear.

4: No (see above). But, if yo decide you need one, ask the F-List first. I have found them to be very helpful and honest.

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Content last modified: January 20, 2014 at 10:09 pm


Category: Transmission and Clutch - All, Transmission and Clutch - Transmission

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We are an organization that gathers and recreates yesteryear’s information for today’s needs. We have specialized in information for the First Generation Firebird (1967, 1968, and 1969).

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