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post #1 of (permalink) Old 12-14-2004, 11:59 AM
greg_Z71
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3:90 gears

i have a 1979 jimmy with a 350 and a 700r4 trans the truck is lifted 8" and i have a set of 35X16X15 superswamper boggers on 15X12's im wondering if 3:90s would be good for this truck i do some offroading on weekends and drive it to work everyday it now has lol 3:08s thanks tell me what u think
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post #2 of (permalink) Old 12-14-2004, 01:20 PM
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Re: 3:90 gears

Wow.. 8" of lift is a lot for 35's, do you think there is ever a chance that you may choose to go with bigger tires in the future? With the 35's I would probably go around 4.10's, no sense in cutting it too close if you are going to do the swap anyway.
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post #3 of (permalink) Old 12-14-2004, 01:42 PM
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Re: 3:90 gears

yeah i thnk im goin to be buying a set of 39.5X18X15 boggers
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post #4 of (permalink) Old 12-14-2004, 02:25 PM
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Re: 3:90 gears

Don't laugh at your 3.08 rearend. I have an 81 Jimmy with a 305 and 2.73 gears, that is not an lol, but "cry out loud". Who would, in their right mind, put those gears in that heavy a truck? I am going to either 3.73 or 3.90, but being a poor person, it may be awhile.

Good luck,

Jim
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post #5 of (permalink) Old 12-14-2004, 02:38 PM
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Re: 3:90 gears

what do u have on it for tires? wow 2:73 she must be pretty sluggish eh?
post #6 of (permalink) Old 12-14-2004, 04:02 PM
 
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Re: 3:90 gears

since when were there 3.90 gears offered? I thought there were jusst 3:73's and 4:10's?
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post #7 of (permalink) Old 12-14-2004, 06:25 PM
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Re: 3:90 gears

since richmond became a company !
post #8 of (permalink) Old 12-14-2004, 08:15 PM
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Re: 3:90 gears

[ QUOTE ]
since when were there 3.90 gears offered? I thought there were jusst 3:73's and 4:10's?

[/ QUOTE ]

Yeppers, they have been around forver.. lot's of gear ranges out there.. just seems like everyone only knows the ones that are always mentioned.. [img]images/graemlins/crazy.gif[/img]

.... 3.73, 3.90, 4.10, 4.33, 4.56, 4.88,... etc etc
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post #9 of (permalink) Old 12-14-2004, 08:21 PM
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Re: 3:90 gears

[ QUOTE ]
yeah i thnk im goin to be buying a set of 39.5X18X15 boggers

[/ QUOTE ]

If that's the case, I would think about 4.56-4.88 range... or 4.33-4.56

What axles do you have in there anyway? If you plan to go with 3/4 or 1 ton axles in the future, then I would do the gear swap in them... and think about living with the gears you have now if they are 10 bolts. No sense in swapping twice. If you plan to keep what you're running now, then I would advise getting the lower gears now, for when you get the bigger tires. Just my 2 cents.
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post #10 of (permalink) Old 12-16-2004, 11:15 PM
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Re: 3:90 gears

I am just running 31's, but I would like to be able to use up to 33's.

Merry Christmas,


Jim
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