He needs to run a lower gear (higher numbered) than 3.36. Tire diameter taken from here at Summit Racing's website.įorgive me if I am wrong GT- but, the gentleman with the original post has a close ratio Muncie with a low first gear of 2.2. The 255s dropped my RPMs to about 350 running at 60mph. I'm running 3:55 rear gear with a M20 4speed. Then go with a P255 size tire: diameter at 26.80 in. Paul, if you're planning on dropping the rear gear ratio, I'd say go with the 3:36 grears. Sourcing one in the UK is my next hurdle! I am in agreement I would rather get a 8.5" stronger unit, which will give more options in the future should I need them. Lot's of swings and roundabouts on this one. I think (hope) these are perfect - not too overpowering from the side view, but far more meaty from the rear. I have now some 265/50R15 Cooper Cobra rear tyres which will match (will need 2 new 15" rears also), but they look just right in width, are about 25.5" diameter uninfalted, and dont look too fat / tall. I have seen other cars (not 67 GTOs arguably) with them and they are too big, they more than fill the arches, which isnt the look I want. I've considered the 275/60, but felt it was too large / tall for my car. I also need 2 new rear wheels to take the wider tyre. Maybe the overall diameter of the 255/60 BF tyres is a lot less also - I just dont know. The extra inch diameter would help, but my 225/70R14 tyres diameter spec is about 26" diameter, but they measure 24.5". I've considered the 255 width, and while it's a little bigger than my 225 (which are too thin), it was questionable whether I'd get the gain for the outlay, by gain I meant are they wide enough. So I'd have to change 4 tyres which gets pricey. For some that might not matter, but it would bug me especially with the big white lettering being different. I have Cooper Cobra tyres all around, so changing to to these rears will mean the fronts wont match. I need to be able to cruise at 70mph without too much effort - big lorries will pass me at 60mph over in the UK, but yes this could work if I used these tyres perhaps. Olds & Pontiac, both could have used that major upgrade a year earlier for their performance '66 A-bodys. ![]() For '67 Pontiac went to nodular iron casting of the 8.2 Pontiac 10 bolt center housings in its strongest performance rears to reduce pinion deflection. Olds engineers specified the Pontiac normal gray iron converging rib Pontiac 8.2 10 bolts in the manual transmission equipped '66 442's, as the torque of the early Olds 400's was destroying the Buick cast 8.2 10 bolts. The other really weak 8.2 10 bolt was the gray iron single rib 8.2 Buick cast 10 bolt rear used in '64-66 Buick A-bodys & '64-66 Olds A-bodys. ![]() The Chevy 8.2 is one of the two weakest GM 10 bolts ever built as they have next to no pinion support. I have avoided building the early 8.2 Chevy 10 bolts, have had many friends & customers blow them up with moderate hp/torque SBC's. To compound matters further, the '64- early '65 early Chevy 8.2 10 bolts used a much smaller height crush sleeve than the taller style used in mid '65 to 72 versions. The high ratio Chevy 8.2 10 bolt carrier accepted 2.56 & 2.73 8.2 Chevy gears. The low ratio carrier accepted 3.08, 3.36, 3.55, & 3.70 factory gears (also old Zoom gears, etc, for "performance"). The Chevy 8.2 10 bolts had the carrier split at 3.08. If this 10 bolt rear is original to the '65 Chevelle or Malibu that it was pulled from, it will be a c-clip axle 10 bolt Chevy 8.2 rearend not an early bolt-in axle Pontiac 8.2 or early Buick 8.2 10 bolt.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |