AE86 SR5 Rear End?

arvin429
Club4AG Regular
Posts: 20
Joined: Thu Feb 16, 2017 3:55 pm

AE86 SR5 Rear End?

Postby arvin429 » Tue Mar 07, 2017 7:16 pm

I have a 1987 SR5 and it was originally an automatic but the people before me converted it to a manual. I was wondering if the sr5 automatic rear end is strong enough to handle the power of the 4age.
Thank you

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davew7
Club4AG Enthusiast
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Joined: Fri Jun 06, 2014 4:34 am
Location: Michigan

Re: AE86 SR5 Rear End?

Postby davew7 » Wed Mar 08, 2017 4:54 am

The SR5 rear axle is more the adequate for a stock 4AGE. The SR-5 axle [S series 6.38 ring gear] will have a 3.9 ratio or a 4.10 axle ratio. The axle is probably the 4.10 since the original car was an automatic. This ratio, actually better suits the power band of the 4AGE engine. Dave W

arvin429
Club4AG Regular
Posts: 20
Joined: Thu Feb 16, 2017 3:55 pm

Re: AE86 SR5 Rear End?

Postby arvin429 » Wed Mar 08, 2017 10:10 am

I was hearing that sr5 rear ends were breaking under the 4ac motor so I was wondering if the 4age would be too much. Thank you for clearing it up

Deuce Cam
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Location: AZ

Re: AE86 SR5 Rear End?

Postby Deuce Cam » Wed Mar 08, 2017 4:45 pm

Drifting, clutch kicks, welded diff, burnouts, etc. will easily roast an sr5 rear, even a gts rear...

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xslowpokex
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Re: AE86 SR5 Rear End?

Postby xslowpokex » Thu Apr 27, 2017 9:00 pm

davew7 wrote:The SR5 rear axle is more the adequate for a stock 4AGE. The SR-5 axle [S series 6.38 ring gear] will have a 3.9 ratio or a 4.10 axle ratio. The axle is probably the 4.10 since the original car was an automatic. This ratio, actually better suits the power band of the 4AGE engine. Dave W
i completely disagree, 4.7-4.9 exploit the performance potential of the 4ag, 4.3 is a good medium best of both world reason why most gts's came stock with that drive, and 4.1-3.9 is great for long distance highway driving but suck for motorsport if using a 4ag, u need a more powerful engine for that gear...but an sr5 rear can easily hack the power from a 4ag, especially from an automatic rear, that rear has probably seen very little abuse lol :)

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