I'm new to the forums
and I've got a 1967 GTO with a Turquoise/Teal exterior interior 428, TH400, and 3.42 posi. I am look to make this car a truly reliable daily driver and there has been several questions Ive been meaning to run by if anyone can answer.
The car has been in my possession since Sept of last year. It is a New Mexico car (very very rust free
) with a 10 yr old paint job that is top quality. The test drive felt solid and it had pretty nice interior, so i bought it for 15K. The engine block from what was told to me was a Service Replacement 421 that was bored to a 428 with #16 1970 heads. Ive since confirmed this and it is indeed a late 1966 421 casting, but it is any ones guess as to the internals.
The transmission is my first mystery. It is a TH400 and the previous owner said it was rebuilt by TCi in 1999 with a shift kit. It is missing the tag on the passenger side, has a 4" tail shaft and the VIN above the driver side of the pan reads 23P2677XX. Is there anything that I can determine from this number?
The rear end is the next mystery. It seems that I now have a rear seal leak, but, I need to know what it is first of all. I took a wire wheel to what I could reach and found the codes 402227 and CFD4 (these two were found in the webbing) in addition to a letter code SF on the rear passenger side tube. Also there was a very big letter "P" stamped on it. It has a 12 bolt smooth cover (no V) and the previous owner claims it to be out of a 71 gto. There is no info whatsoever I can find on pontiac rear ends. Is this a C clip, and is the bearing pressed in the tube or on the axle (if it is the 2nd I can run down to Napa and they'll do it for me in an hour) And if anyone could please link to the exact bearing and seals I would need that would be nice.
I drive this car quite often and I just want to give it more oopmh where I can w/o an engine removal. First thing I did was had new dual exhaust from the headers installed (the old dual had bent holes in the mufflers like the car was dropped on the edge of a curb). I run MSD ignition 6AL, just replaced the Q-jet with an Edelbrock 750cfm 1411 Carb. I also put a high performance mechanical edelbrock fuel pump on. I recently replaced the timing chain (which had a crap load of slack) for a comp cam double roller.
It is my feeling that when I really mash it, on a hot day, from 0mph, the engine feels like its just not getting enough air. The scoop is always open, but the air filter has the chrome covering which drops over the sides of the filter and has louvers to let air in. Ive read about the aftermarket ram air kits from Y1 and OPG with the pan and foam sealer and Im considering putting that on in addition with a new filter.
Has anyone used an aftermarket RA kit, and what diameter does the filter need to be to fit?
Lastly, I live in Albuquerque where I-40 and I-25 meet. I am on highways constantly and with 3.42 gears I'm getting 3000-3100 rpm at 70ish which is too high causing more engine wear and fuel usage. I like my takeoff however and Id like to keep it. I read up on the Gear Venders kits which is a gear splitting mechanism that attaches between the tranny and tailshaft and adds and OD of each gear including a 3 OD which sounds like it might get me to 2400ish rpm at 70.
My main concern is the fit. I know that I have a Th400, but does anyone know if that would fit in the tunnel? Looks like the 4" tail might be a godsend. I know id have to shorten the drive shaft and the angle to the rear end is only very slight as it is. I would really want to figure out the fitting before I throw $2600 and some for the kit.
Thank you to any replies. I know that the pontiacs have much less info and parts out there than chevy, but some how that thing just got in my heart.
This is my first muscle car and Ive noticed I never get pulled over no matter what; unsung respect?
And hey does any one have a quick guess at horsepower? (10.5:1 comp)