Best auto tranny for mild 351

CarFreakGT · Nov 28, 2012

I'm looking for ideas/suggestions for an automatic tranny that will work well in my 68 coupe. The engine going in is a 351 making ~325 hp. The car will be an occasional driver, w/ a possible rare dragstrip run. TIA.

crane550 · Nov 28, 2012

I am pushing about 400hp with a C4. I have seen 700hp Fastbacks running C4's. Should be fine!

CarFreakGT · Nov 28, 2012

Thanks for the input, crane. I was hoping to hear that as I have a C4 available. Going from a 302 to 351, will a C4 need any modifications? I do intend a rebuild before installation.

clement · Nov 28, 2012

if your trans guy is worth his salt a stock c4 will be fine.

Jarrod@latemodel · Nov 28, 2012

Another vote for a C4. Had one behind a 408 in a fox. Never gave me any problems.

mtaqua · Nov 28, 2012

I'd run a C-4, but wanted to let you know a TH400 will fit. I couldn't find anyone with one in a 65-66 when I was trying to decide. Mu current build will be pushing the limits of a C4 and I know I will upgrade again at some point, so I made the jump to the TH400.

rbohm · Nov 28, 2012

the sky is the limit depending on your budget. you can opt for a nice C4, all the way up to a modified 700r4(i think) that has six forward gears(you only need something like $7000 for one.). i would stick with a C4 or a built up AOD.

woodsnake · Nov 29, 2012

depending on your rear gear, now would be the time to look into an O/D trans. They are really a HUGE improvement over any three speed.

CarFreakGT · Dec 1, 2012

woodsnake said:
depending on your rear gear, now would be the time to look into an O/D trans. They are really a HUGE improvement over any three speed.

Thanks again everyone for the input . . . it's invaluable to me. The rear will be 3.73

Edster · Dec 10, 2012

Depending on available cash you could get a gear vendors OD unit. I'm not a fan of the AOD as first gear is too high for my liking. But figure in the cost of the gear vendors unit you could possibly get a lower 1st gear for the AOD for less.

Sharad · Dec 12, 2012

CarFreakGT said:
I'm looking for ideas/suggestions for an automatic tranny that will work well in my 68 coupe. The engine going in is a 351 making ~325 hp. The car will be an occasional driver, w/ a possible rare dragstrip run. TIA.

My vote is a C4 from www.dynamicracingtrans.com

That's what I'm running.

blown65 · Dec 12, 2012

C4 will be fine, im only pushing around 800 thru my pa and its hoolding up fine so far, 3 yrs prior at 600hp and 100s of passes.

Best auto tranny for mild 351

CarFreakGT

crane550

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CarFreakGT

clement

Jarrod@latemodel

mtaqua

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rbohm

woodsnake

CarFreakGT

Edster

Sharad

ALWAYS choose the V over the P!!! Wait... what?

blown65

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Best auto tranny for mild 351

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ALWAYS choose the V over the P!!! Wait... what?

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