v6 to v8 uppgrade change the trannie?
11-21-2000, 11:28 PM
#1
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v6 to v8 uppgrade change the trannie?
when i upp my 91 rs to a v8 305 outa a donor iroc do i have to change my transmission aswell .. the one in the iroc is blown .. i need to know soon plese someone get back to me. thanx
11-22-2000, 09:41 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
The V-6 transmission will not bolt to a V-8.
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.
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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R. 2.73 unlimited slip. Cat-back from '91 GTA, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LB9 w/ZZ3 cam, TBD heads, exhaust, paint, etc.).
57 Bel Air, my 1st car. 0.030 over 396, Weiand Action+, Edelbrock 1901 Q-Jet, Jacobs Omnipack, 1-3/4" headers, TH400 w/TCI Sat Night Special conv & shift kit, 3.08 10-bolt, AMSOIL syn lubes bumper-to-bumper. Best 15.1 @ 5800' Bandimere. Daily driver while Camaro was being put together.
12-01-2000, 10:58 PM
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Car: 1991 Corvette Coupe
Engine: L98
Transmission: 700R4/4L60 same trans different name
question to five7kid: WHY do you say the tranny won't bolt up? i heard it would if you just change the bellhousing
12-02-2000, 10:11 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
What I said applies to automatic transmissions. If you're talking about a manual, then what you said is true. However, from what I've heard, you still don't want to use a V-6 manual tranny on a V-8 because of gearing and strength.
12-02-2000, 10:22 AM
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Originally posted by five7kid:
What I said applies to automatic transmissions. If you're talking about a manual, then what you said is true. However, from what I've heard, you still don't want to use a V-6 manual tranny on a V-8 because of gearing and strength.
What I said applies to automatic transmissions. If you're talking about a manual, then what you said is true. However, from what I've heard, you still don't want to use a V-6 manual tranny on a V-8 because of gearing and strength.
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1992 Camaro RS 3.1L
T5 Manual 5 speed
Open Air Intake
Z-28 Exhaust
8.5mm MSD Ignition wires
TB Coolant bypass
Kills:
95 (****) Probe GT
94 Mustang GT
91 CRX (dont ask me why he raced me)
2nd Gen Z28 (350) haha to you V8 guys!
1992 RS 305 TBI (good race)
More to come
12-04-2000, 02:31 PM
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Save some money for a new tranny. Just because it may bolt up doesn't mean it will hold up. Many people on this board have found that T5's don't like big torque motors--that's one main reason many switch to a T56.
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12-05-2000, 08:53 PM
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Car: 1989 Firebird Formula
Engine: Internal Combustion
Transmission: Completed
Axle/Gears: ones that turn.
The input shaft of the V6 tranny is different than those on the V8 models. The V6 has a 15/16" shaft with 14 splines vs. 1 1/8" and 26 splines. You may be able to get a V8 shaft from a transmission shop, but you will need to remove the existing input shaft, and count the number of teeth on the transfer gear, and get one with the exact same number of teeth, but with the V8 spline count...they may not be available.
The cases themselves have the same mounting pattern to the bellhousing....just the internal gears and shafts are different.
All said, I would definitely recommend starting with at least a V8 tranny, or save yourself the time and swap in a T56 right now.
Pete
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Pete's Place
HiOutput <a href="http://www.hioutput.com/rpmworld.html">Virtual Racing Team</a>
<IMG SRC="http://www.hioutput.com/pics/SC.gif" TITLE="Pete's 83 SC">
My 83 SC...(originally V6) 201,900 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, custom air induction .....best ET is 14.935@94.14</P>
The cases themselves have the same mounting pattern to the bellhousing....just the internal gears and shafts are different.
All said, I would definitely recommend starting with at least a V8 tranny, or save yourself the time and swap in a T56 right now.
Pete
------------------
Pete's Place
HiOutput <a href="http://www.hioutput.com/rpmworld.html">Virtual Racing Team</a>
<IMG SRC="http://www.hioutput.com/pics/SC.gif" TITLE="Pete's 83 SC">
My 83 SC...(originally V6) 201,900 mile LG4/5-speed from an 84 Z28, 3.42 one-tire-fryer, T-tops, PW, PH, boxed LCA's, Hedman Hedders and y-pipe, Dynomax cat-back, .420" lift cam, custom air induction .....best ET is 14.935@94.14</P>
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