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I would like to put the rear differential from my 65 dynamic 88 convertible into my 1965 Starfire. It is drum to drum. The convertible gear is a 2.93 to one and the Starfire is a 3.23to one. this would give me better fuel economy on the highway. My question is I wanna change the rear wheel cylinders and I don稚 know which ones to order when I went to change the rear differential gasket I had a very hard time finding the correct one. It looked like an oversized 8.2 Gasket I知 wondering if anyone knows the correct wheel cylinders for these differentials. Thanks. Mike L. I知 sure you guys know what痴 what?
Are you undertaking this project just to improve fuel economy? Because while the loss in acceleration might be noticeable, the gain in gas mileage probably would not -- at least not enough to make it worth the effort of doing the swap.
My gut is that the wheel cylinders would be the same -- after all, they're essentially the same car -- but somebody with more knowledge on the topic will weigh in, I'm sure.
I知 actually doing it to reduce the RPM on the highway. I was going to, and I still may put a 700R4 transmission, but I wanted to try this first as I have the differential ready. I took the car on an hot rod power tour in June and driving at 3200 RPM. All day was just no fun, plus trying to keep fuel in the tank is nearly impossible. Acceleration means nothing to me in this type of car if I wanna go fast, I値l drive my 32 Ford coupe!
I'd just quit dicking around with the diff and go straight to the 700-R4 as it's my guess that that's what you'll end up doing anyway. It's the best of both worlds and the difference in terms of both engine RPM and gas mileage will be much more noticeable than the proposed rear end swap.
Well, it痴 not too much about the difference in gear ratio. It痴 about identifying the differentials. I am putting the 3.23 differential back in my convertible because that痴 the around town car. The Starfire is the highway car. That痴 what I drive to events and the seashore And car shows out of town.
I知 really just wondering, what kind of wheel cylinders these automobile have? I found the Felpro part number for the differential cover gasket on a thread in this form. Multiple tries in parts stores around my area came up with the wrong part consistently. Both my 1965 cars were built in Linden, New Jersey and both have the same rear housing with different gear ratios. ultimately, I would rebuild the wheel cylinders if I could find the right rebuilding kit. Rock auto has multiple listings for 88, 98, but no Starfire. To say the least, I am frustrated finding parts for these cars, and I know the parts are available. That痴 my story and I知 sticking to it!!!
According to the 1975 Olds parts book, all 65 and 66 Olds except F-85. Jetstar 88 and Toronado
Took rear wheel cylinders # 5465038 (RH) and # 5465039 (LH)
That would include both Dynamic 88 and Starfire.
That "ten bolt" rear axle is a Pontiac-sourced 8.875" axle, used in all Olds full size cars except the Jetstar 88 for the 1965 model year. Note that despite the ten bolt cover, there are actually 12 bolts holding the ring gear to the carrier. Wheel cylinders should be the same for both Dynamic and Starfire that year. Rear wheel cylinders should be 1.0" bore.
Joe, thank you very much for the information which is exactly what I was looking for. I知 just wondering would this be considered a BOP differential or strictly a Pontiac? Your input is greatly appreciated. Thanks again Mike L.
Joe, thank you very much for the information which is exactly what I was looking for. I知 just wondering would this be considered a BOP differential or strictly a Pontiac? Your input is greatly appreciated. Thanks again Mike L.
It was Pontiac-sourced, called a Type P. There is no "BOP" differential, as each division had slight differences in their axles. Well, in the Chevy-centric world anything that isn't Chevy must be "BOP"... The 8.875" Pontiac axle was used by Olds and Pontiac in full size cars as a replacement for the 1964-older 9.3" axle. Olds released the 9.3" Type O axle for their full size cars in May 1966, but continued to use the Type P alongside of it (primarily on low HP cars) until the end of the 67 model year.
The 8.875" Pontiac axle was used by Olds and Pontiac in full size cars as a replacement for the 1964-older 9.3" axle. Olds released the 9.3" Type O axle for their full size cars in May 1966, but continued to use the Type P alongside of it (primarily on low HP cars) until the end of the 67 model year.
