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post #1 of (permalink) Old 12-14-2000, 11:11 AM
MarkF
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35\" w. 3.73 and an Auto

I just got an unlifted 1986 CJ7 with Chevy 350, TF999, rear D44. The guy told me the gear ratio is 3.73 which was the stock ratio. Can anyone confirm this?

I am debating putting on 33" or 35". I was leaning toward 35", but I wasn't planning on regearing. How poor will the performace be with 35" and 3.73 with TF999?

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post #2 of (permalink) Old 12-14-2000, 11:44 AM
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Re: 35\" w. 3.73 and an Auto

if its the stock ratio....then im sorry to be the bearer of bad news...but you have 2.73...not 3.73.......i would strongly recommend changing the gears before you put on 35's......it might be bearable with 33's and an auto...but i think 35's might be too much


just my opinion

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post #3 of (permalink) Old 12-14-2000, 01:36 PM
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Re: 35\" w. 3.73 and an Auto

Yup that's what I was afraid of, which is why I have a different post asking if 3.73 were a stock option in 1986 or not.

Damn, thats another G I wasn't planning on spending.

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post #4 of (permalink) Old 12-14-2000, 02:02 PM
 
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Re: 35\" w. 3.73 and an Auto

After '76, the AMC 20 was the the only axle used in CJs with two exceptions. Some CJ-7s with the Borg-Warner Quadra-Trac transfer case came with a 30 spline, one piece shaft, offset, narrow track Dana 44. The other exception is in 1986, when CJ production was coming to a close AMC 20s were in short supply, so they used wide track Dana 44s in some of the '86 models. Bolt on compatible with any '76-'86 CJ, but wider than earlier narrow tack AMC 20s. Use of the Dana 44 in 1986 began somewhere between serial numbers ending with 049379 and 054173. The axles were flanged, but I'm not sure of the spline count. Common ratios were 2.73 and 3.31.



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post #5 of (permalink) Old 12-14-2000, 02:25 PM
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Re: 35\" w. 3.73 and an Auto

This is a 1986 Jeep CJ7 and the production # is way after 054173, it is 078***.

Was there any logic for the 2.73 vs 3.31? Flanged is that a good thing or a bad thing.

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post #6 of (permalink) Old 12-14-2000, 02:38 PM
 
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Re: 35\" w. 3.73 and an Auto

I got that info from the tech section /factory options/ from off-road.com/ jeepweb.


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post #7 of (permalink) Old 12-14-2000, 03:10 PM
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Re: 35\" w. 3.73 and an Auto

I'd do the old count the ring gear teeth and divide it by the pinion gear teeth to make sure. 3.73 gears/with a v8 might be ok--especially if you don't have overdrive and you do alot of highway. Otherwise most people go with 4.56. I run 35's and 4.11. OK with me.

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post #8 of (permalink) Old 12-14-2000, 03:15 PM
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Re: 35\" w. 3.73 and an Auto

I purchased two jeeps last year - and '85 with a 999 tranny & an '86 with a 999 tranny & Dana 44 rear axle. Both jeeps had 2.73 ratios -I would bet this is what you have - I made 1 jeep out of them - I still have the stock 2.73 gears & 999 tranny - I have 33x12.5 tires (used the Dana 44 rear). It is bearable on the road- sux on the trail- I would really like to have at least 3.54 gears - I spoke with someone onetime who said that I would "hate" 3.73 gears with an auto tranny in my jeep - it would be too road unfriendly (& this was a JJUSA trailguide) - I think the best way to go is to get a tera-lo 4:1 kit for your D300 t-case & either don't do a gear change at all or possibly go with to 3.54 or 3.31 gears, especially if you are going to 35" tires. On the flip side however, used 3.73 gears can be found fairly easily as many CJ5's came with a Dana 44 & Dana 30 axle setup with 3.73 gears - I almost did this until the trailguide said I'd "hate" it. My jury is still out, that is my $.02 - I can't decide what to do myself yet, but thats the scoop. THEN AGAIN, your 350V8 I'm sure is a lot peppier than my 258I6 - so your 2.73 gears might not be so bad - more fuel for the teralo.

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post #9 of (permalink) Old 12-14-2000, 05:00 PM
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Re: 35\" w. 3.73 and an Auto

quadratracs were never equipped with a dana 44 rear axle. if there is one in there, it was swapped in.

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post #10 of (permalink) Old 12-14-2000, 05:50 PM
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Re: 35\" w. 3.73 and an Auto

Just to clarify, my 1986 CJ7 is a Chevy 350, TF999, D300 w/ D44 rear. The rear hasn't been touched so I'll see if I can spot any stampings on the axle. Or I'll pull the cover and count teeth or the tire rotation and count the yoke spins.

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