Carrier Swap or Rear assembly swap - Pontiac GTO Forum
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post #1 of 7 (permalink) Old 07-16-2013, 11:23 PM Thread Starter
 
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Carrier Swap or Rear assembly swap

My 67 has a 12 bolt donor rear with 4.10:1 r&p gears. I don't take it to the strip so it's a bad fit for me.

Any opinions on what's most cost effective, swap out the carrier and the r&p for a 3 series carrier and and 3.55:1; or try and locate a Poncho 10 bolt 3.36:1 and get it back closer to "stockish"? I priced the carrier swap option through Randy's R&P and I'm looking at near a grand for parts alone. Still trying to find a 10 bolt 3.36:1 (or so) from a similar era car.

Both options I'd be selling the old carrier an 4.10s or selling the full 12-bolt rear assembly drum to drum.

Just for context. Trying to get my car baby home to a new house two states away. I'm in the process of moving and circumstances are forcing me to finally make this call and get the swap done ASAP. In an ideal world I would turn this 15 year driver project car into a fun family weekend cruiser, I don't anticipate ever winning a drag race or car show.

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post #2 of 7 (permalink) Old 07-17-2013, 05:20 AM
 
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post #3 of 7 (permalink) Old 07-17-2013, 08:21 AM Thread Starter
 
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Koppster, thanks for the lead. I thought the 66 rears weren't a good fit for the 67's. I think I remember reading they were slightly shorter? I'm certainly no expert so I could be wrong on that.

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post #4 of 7 (permalink) Old 07-17-2013, 09:09 AM
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My 67 also had a series 3 12 bolt with 4.10:1 gears which I changed to a 3.42:1 and have been happy with the results. The R&P thru Jegs is a little over $200,

Richmond Gear GM 12-Bolt Ring & Pinion Sets - JEGS

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post #5 of 7 (permalink) Old 07-17-2013, 10:54 AM Thread Starter
 
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I had assumed it had a 4 series, didn't realize the 3 series could also have 4.10s, I've got some more investigating to do.

If I do have the 3 series, I might be able to save a lot.

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post #6 of 7 (permalink) Old 07-17-2013, 03:29 PM
 
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I have a 72 Lemans. I just swapped in a 66 Tempest 3.36 rearend. It is shorter than my 72. But its in place with the tires on and I can't tell the difference. There are no clearance issues. The only problem I had was I had to get coil spring retainers and exchange my new 72 springs for 66 springs. The spring pad on the rears are different.
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post #7 of 7 (permalink) Old 07-21-2013, 03:55 PM
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The '66 and earlier 8.2 rear ends are 1 inch narrower (shorter axle tubes). This will allow more tire clearance, which is a good thing.
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO Undercarriage, Frame, Transmission and Differential Discussions.

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