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#1
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Availability of a 65 3.90 rearend?
I have a chance to buy a 65 Tri-Power 4speed GTO. It originally had a 3.90 rearend. It was replaced somewhere along the way with a 3.23. I am wanting to see if there might be a rearend out there and if so, how much it might cost. Thanks for your help or input.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#2
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If you already have the 3:23's in there you can just buy the gear set & have them installed. The 3:90's are an easy set to find & buy. They will run about $ 250-300 for the gears set & depending where you live it may cost anywhere between $ 250 -600 to have them installed.
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#3
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Hi Rex. The car is numbers matching and the rearend housing is the only major part that's not original. It even has the correct notched fan. That is an alternative but I hope I can find a correct rearend. Thanks for the response.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#4
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Not 100% sure , but I don't think 3:90's will fit in the 3:23's housing.
Check that before buying. |
#5
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fitment??
Done that!
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#6
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PM sent. Also, I think the 3.90 will fit the housing, but it will need a different carrier. Need to double check.
Tony |
#7
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Need different carrier--or a ring gear spacer.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
#8
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What code is the rear that's in the car now?
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#9
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I'm not sure on the code. I have not purchased it yet.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#10
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I am hoping to find a correct housing with the correct code not just change the gears. Thanks for all of the input! I appreciate the help!
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#11
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My 73 came with 3:08's in it new & all i had to do was change the gears to the 3:73's that are in there now. As long as it's a 3 series carrier you can bolt up to the 3:90's in it with no other parts . When you go to the 4 series gears then you will need a different carrier or a ring gear spacer. That has been my experience so far with changing gears.
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#12
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As stated, in an 8.2 '65 rear end, 3.90 gears will not bolt to a 3.23 carrier, which works for 2.93, 3.08, and 3.23 gears. A 3.36-3.55-3.90-4.33 carrier is needed. When I re-geared the 3.55 in my own '65, 3.36 was as low as I could go numerically. Spacers are not a good idea in this already weak rear end. The OP's logic of finding a complete original 3.90 housing with gears intact is the best way to go, and will add value to his car.
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Jeff |
#13
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8.5 vs 8.2
Quote:
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Own many Olds including 1972 442 W-30 (last 4 speed W-30 built); 1970 Cutlass W-31 #s match auto 3.91s; 1965 442 461 cid BBO & Richmond 5 speed; 1987 442 with 470 cid SBO 11.37 @ 119.4; 1972 442 524 cid BBO race car 10.89 @ 122.5; 1973 442 350 automatic black & white; 1980 GMC 468 cid BBO powered. Past owner of an original paint 1973 Esprit. Looking for the keeper 1970-1974 Pontiac F body. |
#14
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Were the original 65 3.90 rearends nodular cases with the large "N" on top of the case?
Thanks.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#15
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I have a 8.2 limited slip for a 3.90 and a new set of gears if you're interested.
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Johnny US Army Retired 1978 T/A 463 Pontiac, KRE 74cc 292CFM D-ports, Lunati VooDoo, V-max lifters, TKII, ATM 850 E85 carb, TCI TH-350 race tranny, 3600 converter 3.73 12 bolt 11.63@116.68mph 1981 T/A 4-speed 406 Pontiac, Merrick ported 6X heads, Comp 270S cam, Crosswind intake 750 Street Demon, 3.42 30 spline Eaton posi street car. 1980 Formula 350 Pontiac back burner project 1972 LeMans 350 Pontiac |
#16
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Thanks but, I am looking for an original 3.90 axle with the correct codes and stamps for this car. I could possibly use it for another car though. PM me with a price if you don't mind.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#17
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Quote:
the casting # and date code are on the bottom of pinion area of case. you may be able to play with changing date code with some art work. you are going to need a lot of luck finding this. so good luck! |
#18
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Quote:
Thanks for the great information! That's what I need. Another member gave me a heads up on a possible axle. Now I can look for the correct casting.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
#19
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the correct date is the harder part. if your not critical on that it makes it easier. the 64 housing is different in that the upper eyes in the housing for bushings for upper control arms mount are smaller. the 66 case is wider ( some don't think so). i will get gruff on that. but the casting number will be different even if i'm wrong most likely.
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#20
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The guy with the axle is checking the casting and date codes for me. It came out of his brothers car years ago. He says he has the PHS report that shows it was a tri power, 4spd, 3.90 car. So, I'm hoping it's real. My car was an April build so maybe I'll get lucky. Thanks for your help. I'm pretty fair with the 68-72 GTO's but not so much on the older ones.
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68 GTO Ram Air I Auto, Starlight Black/Teal-Survivor 68 Firebird Ram Air II 4spd, Aegena Blue/Black/Black 68 Firebird 400 Conv. Auto, Red/Parchment/Parchment 69 Firebird Ram Air IV, 4spd Matador Red/Black-Survivor 70 GTO Ram Air III 4spd Conv. burgundy(currently Black)/White/Black 71 GTO 455HO 4spd, Lucerne Blue/Black/Black 71 GTO 455HO Auto, Lucerne Blue/Sandalwood/Blue |
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