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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jan 2003 Posts: 68 New Guy | | New Guy Joined: Jan 2003 Posts: 68 | Got another question for the driveline gurus...
I'm building a 350 v8 for my 1950 AD truck. I plan to bolt a TH400 automatic tranny to it (the rear has already been swapped for a unit with better highway gears).
It appears there are 2 different sizes of flexplates available for my engine and I'm not sure if only one will work for my plans, or if either will. It appears there's a 14" diameter unit with 168 teeth and a 23-3/4" diameter unit with 153 teeth.
My question is, which one should I install on my new engine?
Thanks for any and all replies!
Tom | | | | | Joined: Jan 2003 Posts: 68 New Guy | | New Guy Joined: Jan 2003 Posts: 68 | Oops ... typo... the other option is a 12-3/4" flexplate ... not 23-3/4".
I guess I proof-read it just a little too fast.
Sorry folks!
Thanks again for any replies!
Tom | | | | | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Which one is easiest and cheapest to get replacement parts for?(torque- convertor,,starter etc.)
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
| | | | | Joined: Jul 2000 Posts: 962 Shop Shark | | Shop Shark Joined: Jul 2000 Posts: 962 | Use the one that is compatable with your tranny, torque converter and starter. Also specify year of engine, as that can clear it up too.
chip
Preaching the Hot Rod Gospel according to the 4-stroke apostles:
Suck, Squish, Fire and Fumes
| | | | | Joined: Jan 2003 Posts: 68 New Guy | | New Guy Joined: Jan 2003 Posts: 68 | I havn't purchased the tranny, torque converter or starter yet. I wanted to make sure I didn't buy something incompatible with my goal of 350 v8/TH400 combo.
My engine is a 1970 Chevy 350 4 bolt main.
Thanks again!
Tom | | | | | Joined: Mar 2003 Posts: 45 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2003 Posts: 45 | The 168 toother uses an offset starter bolt pattern.There is one that has all 6 bolts on the same circle,those are for truck turbo 400 and Allison 540-5 series.And there is another common one that has both bolt patterns on it,it uses 3 or 3 bolts,depending on convertor. | | | | | Joined: Jan 2003 Posts: 68 New Guy | | New Guy Joined: Jan 2003 Posts: 68 | Thanks for the replies!
I bought the 14" flexplate with 168 teeth and drilled for 10.75" or 11.5" converter bolt pattern. | | |
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