Rear gear Ratio
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Cruising
Joined: Nov 2017
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Rear gear Ratio
Just a quick question to those who own a 1991 automatic L98 the RPO code is calling for a 2.59 rear axle ratio. Upon inspection I noticed I have a Dana 36 with 3.07 ?? No changes were ever made to the car. Just wondered if they switched mid year and put in the 3.07’s. From the factory. It’s a coupe
Thread Starter
Cruising
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Ok just went through all records and according to original owner no work was ever performed to the rear end. Or a diff fluid change, who knows, but they are 3.07. Thanks for the reply
Team Owner
Joined: Sep 2003
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Some 'D36 will have 3 - 4 lines of information on the bottom of the housing. Some/most D36 don't seem to have that!
Does the SPID VIN match the car?
Thread Starter
Cruising
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Measured by counting the wheel rotation vs driveshaft and at 70 mph it’s rite at 2000 rpm
Last edited by Merlin1650; Dec 15, 2017 at 01:04 PM. Reason: More wording
Thread Starter
Cruising
Joined: Nov 2017
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Team Owner
Joined: Sep 2003
Posts: 25,348
Likes: 2,728
Thread Starter
Cruising
Joined: Nov 2017
Posts: 11
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Been wrenching on these things for years Big block cars that is along with a boat shop for over 30 years , Used my formula to test and backed it up with an on board radar gun and a snap on 2500 scanner hooked up to the test port. Someone told me there was a 3.07 performance axle option but the glove box says otherwise. Just curious if anyone out here had an occurrence like mine. Thanks for the reply’s 👍👍
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Race Director
Joined: Apr 2003
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From: moraga ca
I ordered my 84 new a zillion years ago. I wanted the 4+3 and ordered the optional performance axle. Standard was 3.07, mine was a 3.31. The 84s were the one year when all the rears were Dana 36s.
Thread Starter
Cruising
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Race Director
Joined: Apr 2003
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From: moraga ca
Thread Starter
Cruising
Joined: Nov 2017
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Gotcha was gonna build a 430 23deg 11.1 super ram type and was thinking a 44 would be necessary looking for 600 in hp 550 tq. Thanks again
Safety Car
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Finalist 2020 C4 of the Year - Modified
Zip Corvette sells a modified batwing that has blocks welded to it internally ala the Dana 44 batwing. The blocks support the bearing caps. The top of the caps do need machined to achieve the proper fit. It is considerable cheaper than a 44 and does strengthen up the 36 as far as spring the bearing caps and causing a blowup that way. It will not prevent tooth shear though from a real good hookup and the smaller amount of metal of a D36 gear set lets go.
Thread Starter
Cruising
Joined: Nov 2017
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Zip Corvette sells a modified batwing that has blocks welded to it internally ala the Dana 44 batwing. The blocks support the bearing caps. The top of the caps do need machined to achieve the proper fit. It is considerable cheaper than a 44 and does strengthen up the 36 as far as spring the bearing caps and causing a blowup that way. It will not prevent tooth shear though from a real good hookup and the smaller amount of metal of a D36 gear set lets go.
Sounds like you’ve been there. Thanks for the info. Much appreciated Tom
Race Director
Joined: Apr 2003
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From: moraga ca
I really wouldn't put too much money into strengthening a Dana 36. I blew my 44 a number of times before I went with a straight axle. Others on here have had better luck. I do bracket race often and average about 150 runs per year.