I just put a 350 in my 55 pontiac
I have 355 gears but my driveshaft won't fit into the 350 tranny sploines are different
I guess they changed u-joint size in 56. So I'm looking for a new diff to get a lower gear ratio and a larger u-joint so I don't have to get a custom driveshaft made up thought it would be nice to know the numbers before I tore it out
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when it's all said and done
more will have been said than done !!
If you don't want to change ratio there should be a yoke available to fit your driveshaft and the TH350 AND a ujoint to fit all that!
Is the problem with your front yoke that it's coarse spline? I ran into that on a 63 Acadian with a powerglide. It has a coarse spline output shaft on it. A simple yoke swap solved the problem.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars
I have a yoke to fit the tranny but the u-joint that is on my driveshaft is too small for the yoke
according to lordco there is no u-joint to cross over the small to the large
Also I have a chev driveshaft with the right yoke but the u-joint won't fit the diff. hence changing the diff may solve my problems
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when it's all said and done
more will have been said than done !!
Slowly rotate one tire exactly one revolution with your hand while watching the pinion yoke on the axle. Count the number of times the pinion yoke makes a revolution. The amount of times the pinion yoke turns represents your gear ratio.
yes it is a canadian pontiac came with a 261and a 2 speed powerglide I'm going to walk through my buddys field of hulks tomorrow to see what I can find my oold drive shaft uses a 507 with 1 inch caps and the new drivceshaft I have uses 534G u-joints
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when it's all said and done
more will have been said than done !!
I just put a 350 in my 55 pontiac I have 355 gears but my driveshaft won't fit into the 350 tranny sploines are different I guess they changed u-joint size in 56. So I'm looking for a new diff to get a lower gear ratio and a larger u-joint so I don't have to get a custom driveshaft made up thought it would be nice to know the numbers before I tore it out
Welcome to the site glad your getting some better gears
There are special U/joints that have 2 diff. end caps available. had to use them on 52 with Tremec 5spd to stock 86 ?? Monty d/shaft. Think I used a GM/Ford combo to fit the tremec frt. yoke but should be something available for rear pinion set up too?????
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Some times I wake up GRUMPY, but today I let her sleep in !!!!!!!!BLACKSTOCK Ont.
Still trying to figure out what T-Bucket is doing here??? Asks how to tell what ratio is in car,but then says he's got 3:55's or are they the replacement gears & he doesn't know whats in there??? Way back when, I had a 55 chevy & swapped out a few "pots" for diff ratio's but never had a u/joint problem, just trying to keep a rear end together,went to Olds rear end & that solved the "exploding" gears. Is it possible that the "new" pot has a diff pinion yoke on it for another application & thats why the u/joint won't fit??? The combo U/joint I got from NAPA wasn't even listed in their book, Miles,picked it off the shelf, but couldn't find it "listed" anywhere other than the pricing[Dam]
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Some times I wake up GRUMPY, but today I let her sleep in !!!!!!!!BLACKSTOCK Ont.
thanks carl and others for the input we solved the problem today and carl you were right it was as simple as a yoke swap. Ii was trying to fit a yoke from a S-10 onto the end of my 55 shaft and they have different u-joints once we got the right chevy car yoke everything fell into place
the reason I was interested in gear ratios is because I wanted taller gears because I went from a six cly to a v-8. usually the 6cly gears are around 4 to 1 and those aren't what I wanted for cruising I had several cars to choose from and pulling each one apart to see what the ratio was seamed like a lot of work
any way like I said all problems are solved for now motor tranny and difff all mounted
thanks
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when it's all said and done
more will have been said than done !!
