3.93 to 3.36 - Pontiac GTO Forum
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post #1 of 17 (permalink) Old 04-28-2008, 03:09 PM Thread Starter
 
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3.93 to 3.36

Hi guys!
So, I took my car to get the rear end checked out. He wanted to charge me to take off the housing to check the gears, but I just had him check to see if it was an open carrier. I hope that's the right terminology...anyways, it seems to be a limited slip, so can I go from 3.93 to 3.36 without changing anything but the ring and pinion? I can't seem to find 3.36 anywhere even at Randy's Ring and Pinion. Any suggestions?
Linda
PS. Also, the guy said that Randy's Ring and Pinion can get 3.55, but that's still a little too stiff for me. He said that they can modify a Chevy gear, but you would have to change out the yolk, yadda yadda yadda. It would be three times as much.
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post #2 of 17 (permalink) Old 04-28-2008, 03:32 PM
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Hi Linda. You're doing the right thing. A 3.36 gear is perfect for your '67. It was the standard ratio for automatic trans GTO's in '67. Good power, good acceleration, decent fuel mileage/cruising at highway speeds. A 3.36 is as "long'legged" as you can go with your 4-series carrier. I know. I did the same change. I was able to locate a set of original, used gears for mine. The ring and pinion on these cars almost never wore out, so you should be able to find a matched set of good used gears. I would NOT go 3.55 with your car......with the automatic, you'll be sucking fuel and revving high at freeway speeds. Good luck, and if I come across any 3.36 gearsets, I'll let you know asap.
Jeff
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post #3 of 17 (permalink) Old 04-28-2008, 06:05 PM Thread Starter
 
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Thanks Jeff! That would be great if you could find some! Is $450.00 too much to charge to change the gears?
Linda
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post #4 of 17 (permalink) Old 04-29-2008, 07:55 AM
 
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Linda,

You may able to find a 3:23 gear easier. I had them in my 67 and got 13 mpg. I now have 3:42 with a 12 bolt. Sold the old rear end.

Bill


67 Post Coupe,
69 RA III Judge
06 BOM, M6, 18's
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post #5 of 17 (permalink) Old 04-29-2008, 10:13 AM
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Thanks Jeff! That would be great if you could find some! Is $450.00 too much to charge to change the gears?
Linda
I would expect about that (hopefully less) total including the gears, an installation kit and the labor.
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post #6 of 17 (permalink) Old 04-29-2008, 12:34 PM
 
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Originally Posted by blondie67 View Post
Hi guys!
So, I took my car to get the rear end checked out. He wanted to charge me to take off the housing to check the gears, but I just had him check to see if it was an open carrier. I hope that's the right terminology...anyways, it seems to be a limited slip, so can I go from 3.93 to 3.36 without changing anything but the ring and pinion? I can't seem to find 3.36 anywhere even at Randy's Ring and Pinion. Any suggestions?
Linda
PS. Also, the guy said that Randy's Ring and Pinion can get 3.55, but that's still a little too stiff for me. He said that they can modify a Chevy gear, but you would have to change out the yolk, yadda yadda yadda. It would be three times as much.
Linda, let me know how you make out with your gear change. I'm thinking of going to 3.55s from my 3.90s. Also, let me know what it cost you. Rukee told me that the parts are about half of the $400-$500 total cost, in his estimation. Regards, Paul

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post #7 of 17 (permalink) Old 04-29-2008, 12:45 PM
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Hi Linda. 450 probably is accurate. It may be cheaper to find another entire rear end assembly and swap it in. You may be able to find a '66-'72 ten bolt safety-trac (posi) for around 400 dollars in a 3.36 ratio. A very easy, low tech job. You could ebay your 3.93 posi and more than make out. (steeper geared rear ends bring more $$). Sandu: 3.23 gears WILL NOT work in Linda's 4-series carrier. The lowest numerical ratio she can use is a 3.36 if she just changes the ring and pinion.
Jeff
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post #8 of 17 (permalink) Old 04-30-2008, 10:28 AM Thread Starter
 
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Cost

I don't know about where you guys live, but they wanted $450 in labor + parts! I don't know why, maybe they're trying to take advantage of Blondie67 because I am blond? Some places even quoted me as high as 1600 to do the job. I'm about ready to call this old guy that has had a shop for years and have him do it. He probably knows old cars inside and out and has been doing them for 60 years. He'd probably only charge me $100....
Linda
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post #9 of 17 (permalink) Old 04-30-2008, 10:53 AM
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I changed my own gears and it took about two hours. That included time NAPA took to press on the new bearings onto the pinion gear and carrier assembly. My labor rate must be waaayy too low or somethin. At my shop you`d get that done parts and labor, job done for that amount. Keep looking IMO.
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post #10 of 17 (permalink) Old 04-30-2008, 11:18 AM
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Some places even quoted me as high as 1600 to do the job.
That`s crazy. For a couple hundred more then that you could buy a complete 12 bolt posi rear end! Swapping the whole assembly is almost easer then changing the gears. This one has the wrong gear ratio for you, but I bet with a phone call they would set it up with what you want.
Moser Engineering 12CEAEDAAAXX - Moser Engineering 12-Bolt GM Housing and Axle Packages - summitracing.com
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  Pontiac GTO Forum > The 1964-1974 Pontiac Tempest, Lemans & GTO > 1964-1974 Tempest, Lemans & GTO General Discussion

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