Pontiac GTO Forum banner
21 - 23 of 23 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter · #22 ·
Great info on this thread, and I've had the same results. Not as long as Lust4Speed has, but going on 45 years of driving these cars. I have blown up a couple of 8.2 rear ends. Both time with less than 425 HP, both times with 4 speed transmissions, and both times by running sticky tires and abusing the hell out of them. Last one was in 1990, my '65 GTO, and when it cost me $940 then to have it rebuilt, I haven't hurt one since. Diven with the right technique, no fat slicks, no side-stepping the clutch at 5,000 rpm, and minimal power shifting, you should be ok. When I blew the 3.55's in the '65, I had a 3.36 ring and pinion fitted, as I drive the car and the speed limit was no longer 55 mph. 3.55's suck at any cruise speed over 60 mph, IMO. I removed the 3.36 one-legger out of my '67 GTO with a TH400 and installed a 2.56 posi because it was free. Would rather have had it be a 2.93, my favorite street gear for a TH400 GTO. The 2.56 will burn both tires off from a stop easily, and the 2-3 shift at WOT comes in at 105-107 MPH. Top end is limited to about 135-ish as the front end starts lifting and the steering gets scary. MPG is 21 to 21.5 at a steady 75-80 mph. It has gotten 23 mpg at a steady 65. Not bad for a 55 year old 3800 pound car. It cruises 90 mph at the same RPM my '65 cruises at 75. 8.2 rear ends, especially the 2-pinion ones (most are) are not strong. An 8.5 out of a later car is much better if you plan on abusing it. Driven responsibly, however, they can hold up. The one in my '67 has never been apart and has a zillion miles on it, and the one in my '65 has been fine in the 32 years since it was rebuilt. Becoming an old man has made my parts bills drop a whole bunch.
 

·
Registered
Joined
·
11 Posts
Discussion Starter · #23 ·
Great info on this thread, and I've had the same results. Not as long as Lust4Speed has, but going on 45 years of driving these cars. I have blown up a couple of 8.2 rear ends. Both time with less than 425 HP, both times with 4 speed transmissions, and both times by running sticky tires and abusing the hell out of them. Last one was in 1990, my '65 GTO, and when it cost me $940 then to have it rebuilt, I haven't hurt one since. Diven with the right technique, no fat slicks, no side-stepping the clutch at 5,000 rpm, and minimal power shifting, you should be ok. When I blew the 3.55's in the '65, I had a 3.36 ring and pinion fitted, as I drive the car and the speed limit was no longer 55 mph. 3.55's suck at any cruise speed over 60 mph, IMO. I removed the 3.36 one-legger out of my '67 GTO with a TH400 and installed a 2.56 posi because it was free. Would rather have had it be a 2.93, my favorite street gear for a TH400 GTO. The 2.56 will burn both tires off from a stop easily, and the 2-3 shift at WOT comes in at 105-107 MPH. Top end is limited to about 135-ish as the front end starts lifting and the steering gets scary. MPG is 21 to 21.5 at a steady 75-80 mph. It has gotten 23 mpg at a steady 65. Not bad for a 55 year old 3800 pound car. It cruises 90 mph at the same RPM my '65 cruises at 75. 8.2 rear ends, especially the 2-pinion ones (most are) are not strong. An 8.5 out of a later car is much better if you plan on abusing it. Driven responsibly, however, they can hold up. The one in my '67 has never been apart and has a zillion miles on it, and the one in my '65 has been fine in the 32 years since it was rebuilt. Becoming an old man has made my parts bills drop a whole bunch.
so true today cars are flying on interstate ,honda,s toyota,s suburu, with there tremendous overdrives go right by you,,,,,,,,,,can,t get u on a light but embarrassing on hiway.......
 
21 - 23 of 23 Posts
Top