thats awesome auto or 4 speed what gear ratio ? can you take off fast from a stop ?tks
It's a Tremek TKX 5 speed, wide ratio, 327 first gear, which is much lower than the stock TH400, and 3.36 gears.
What's the gear ratio? I ask because I had a 2.56 open in my near 400 HP 67 for over 40,ooo miles. It was just fine all that time. From a dead stop and straight take-off, the one tire might or might not spin depending on the season, tire quality, road surface, and if it was brake torqued or not. Overall, a nice set up so long as a good launch was not expected. However, the gas mileages was fantastic for a GTO...at 55 mph she would get 17 or better..AND, I could take it up to 50 plus mph in first and get a good chirp going into 2nd. It was a heck of a good 1/2 mile car! Near 140 mph before it got to floating so bad that, at 18 years old, I had to let off.
Taking off heavy and turning at the same time would yield a single-wheel-peel every time, but without safety track, the car would stay in control compared to the same efforts with a posi when the back end would want to come around. SO, it's kind of a safety feature...UNTIL your in the rain on a corner (at near any speed) and you goose it...then the balance of the car and the forces all align (like evil stars) and both tires spin...then hold on and find out how good your recovery skills are. It can catch you off guard and you end up facing the opposite direction or hitting a Ford LTD square in the nose. Don't ask how I know this. lol
So, if your gears are about 3:1 or less, you don't drive like a nut, and gas mileage is important...you're good. Oh, an open in the snow with stock-ish GTO horse power is just stupid.
I will not be putting an open back in mine. I prefer to get better launches, not concerned with the mileage, and I like knowing that it will come out in the back when pushed every time (rather than only occasionally which is a surprise scenario). An open gear set more than 3:1 would be foolish to my way of thinking. You'd always be rotating your tires to keep that one from disappearing and leaving you with 3 good tires. That was a problem with my original set-up let alone a deep ratio. 380 HP with the expected torque calls for a posi ratio of 3.2 to 3.5, thereabouts IMO.
Posi highway gears and skinny tires are a safe way to go. The gears are high...this keeps the tire-spinning on the lesser side, requires less tire traction, if the skinny tires do spin - there is less chance of a hook-up that results in damage, yields better gas mileage, and the posi gives better traction in the rain and gravel. The highway geared rear-ends last longer than the deeper gears since they cannot be abused as much.so if i throw a posi in the 8.2 with hiway gear ,don,t know what i have yet,and with skinny tires you think i be allright ....?
There are too many variables for me to say "if you'll be alright". I don't know how you drive or what the condition of your car is...so if i throw a posi in the 8.2 with hiway gear ,don,t know what i have yet,and with skinny tires you think i be allright ....?
There are too many variables for me to say "if you'll be alright". I don't know how you drive or what the condition of your car is...
But I can tell you this; I have a 67 GTO with 3.36 gears and and Auburn Posi. I built the rear myself in my driveway with the car on jasckstands. I have my rebuilt 400 making at least 400 hp, and I do burnouts all over the damn place. I have 235/60/15 tires... Which arent exactly skinny... Standing still, roll-on's, donuts, drifting... I roast the tires, but the car also hooks and goes!
3.36 is considered the best compromise gear. It's not terrible on gas, and not terrible on performance... but it's also not great at either.i do think the 67 400 335hp came stander with 3.36 i could be wrong ,it mite be a good gear to have..?
This is where the TKX has shined. Im really amazed that somehow, I can cruise at 25 mph in 5th gear, and also go 120 mph in 5th gear.it always felt like I needed to shift again.