Here is the data:

'40 Ford Pickup--street use (no racing) Mostly around town stuff with occasional freeway runs.
Have a fresh '87 305 SBC long block -- adding TPI
Using a 5 speed Camaro stick box and an 8" rear
Rear tires will be 15" , probably around 205 or 225 (no larger)

Initially planning to use a 355 ratio, but I read an article where a fellow was using a 300 pumpkin and said it worked fine. Fact is he recommened using it!

Now my memory also recalls reading that such a ratio had caused some U-joint and drive viabrations at higher speeds...it was something to do with TPI's torque and the computer not working well together.

I currently have a 300 & 325 pumpkin. If they are useable, that would be great...if not, then it's on to something like a 355.

So, anyone out there with experiences with this type system ( EFI, OD, rear end? Thanks, Fred

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In the land of the blind, the one-eyed is KING!

How about looking up 87 Camaro specs to see what ratio came from the factory?
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WPoC

You want to calculate your rpm in overdrive so it will not be too low and lug on you. Go here: www.ring-pinion.com/calculators/calculatorsind.html . Click on RPM and see what ratio gives you an effective rpm.
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Lynn
'32 3W

I have abs of steel. For the protection of others, they are covered with padding.

Let me clarify--not overdrive--5th gear.
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Lynn
'32 3W

I have abs of steel. For the protection of others, they are covered with padding.

if it is overdrive 355's to 373's work well that is what is behind most auto over drives.