XJ gear Ratio ????

joe88xj · Feb 15, 2004

I am regearing and am wondering if theres anybody out there with an XJ auto tranny running 4.56 gears and 33" tires who can tell me what rpm's they are runnin at highway speeds etc etc i have 4.10 gears now not yet installed which if i jump to 4.56's they will be for sale. anybody out there with the same specs as above runnin 4.10's wishing they had gone with 4.56's? i'd rather change my mind about the ratios before i install the 4.10's. TIA

JOE

evilpresence · Feb 15, 2004

Here is a good chart posted by Quadratec.

http://www.quadratec.com/cgi-bin/sg...h_corner/gear_ratio.html&UID=2004021512511562

Beezil · Feb 15, 2004

evilpresence said:
Here is a good chart posted by Quadratec.

http://www.quadratec.com/cgi-bin/sg...h_corner/gear_ratio.html&UID=2004021512511562

unfortunatly, that chart does not solve for auto tranny overdrive.

I take it your jeep is an 88?

88 aw-4's are equipped with a deep overdrive of .71....

that means, with your gears, with a measured tires size of 32.7 (guessing) you will be spinning 2329 rpm at 70 mph.....

Eagle · Feb 15, 2004

joe88xj said:
I am regearing and am wondering if theres anybody out there with an XJ auto tranny running 4.56 gears and 33" tires who can tell me what rpm's they are runnin at highway speeds etc etc i have 4.10 gears now not yet installed which if i jump to 4.56's they will be for sale. anybody out there with the same specs as above runnin 4.10's wishing they had gone with 4.56's? i'd rather change my mind about the ratios before i install the 4.10's. TIA

JOE

I have a spreadsheet that works all that out for you. Send me a PM with your e-mail and I'll send it to you.

kirby · Feb 15, 2004

I'm not satisfied with my 4.10's. I've only had them for about 6 months and am already going to change them out tomorrow. The constant down shifting on the freeway drives me nuts.

juicexj24 · Feb 15, 2004

I have 33" tires and 4.10's with the AW4. It works great for me on the highway and trail. Now I might sign a different song come this summer's trip to Utah. But at 65-70 I'm between 2000-2500rpm. I don't see myself going up to 35" on this XJ so 4.56gears aren't really needed for what I do. juice

kirby · Feb 15, 2004

Wait till you try going 80 on the freeways in utah it will drive you crazy. It downshifts about every few seconds and I heard that's good for gas mileage too!:gonnablow

juicexj24 said:
I have 33" tires and 4.10's with the AW4. It works great for me on the highway and trail. Now I might sign a different song come this summer's trip to Utah. But at 65-70 I'm between 2000-2500rpm. I don't see myself going up to 35" on this XJ so 4.56gears aren't really needed for what I do. juice

joe88xj · Feb 15, 2004

Beezil is that with the 4.56's or the 4.10's? yup its an 88

juicexj24 · Feb 15, 2004

it'll run well beyond 85mph on the gauge without a problem for sure now. But trying to run that up and down mountains is a total other thing. Juice

BillR · Feb 15, 2004

juicexj24 said:
it'll run well beyond 85mph on the gauge without a problem for sure now. But trying to run that up and down mountains is a total other thing. Juice

The mountains and the altitude really make a difference! I live at 7000 ft, and it seriously robs the power from an engine. I have 4:10s and decided against 33s largely for that reason. I only lose 1/2" under the diffs with my 32s, and the engine stays in the powerband better. i run about 2500 rpm at 70-72 mph.

juicexj24 · Feb 16, 2004

well good to know for when I get out there. Thanks. At least I live at sea level. Juice

Beezil · Feb 16, 2004

juicexj24 said:
I have 33" tires and 4.10's with the AW4. It works great for me on the highway and trail. Now I might sign a different song come this summer's trip to Utah. But at 65-70 I'm between 2000-2500rpm. I don't see myself going up to 35" on this XJ so 4.56gears aren't really needed for what I do. juice

juice, it you are seeing 2500 rpm around 65-70 with 4.10's, your torque convertor isn't locking up.

.71OD measured tire of 32.7 4.10 gears

65mph-1944
70mph-2094

.75 OD (91 and up)

65mph-2054
70mph-2212

thats what you should be running...

so either you haven't corrected your speedo accurately, or your torque convertor isn't locking up.

juicexj24 · Feb 16, 2004

ya I still haven't gotten the speedo gear replaced yet. Dealer says the 36teeth I need is on national back order. Thanks for the info. Juice

Beezil · Feb 16, 2004

hmmmmmmm......

do you know if your speedo is long stem or short?

joe88xj · Feb 16, 2004

hey beezil i just bought a set of d30 4.56's

Beezil · Feb 16, 2004

joe88xj said:
hey beezil i just bought a set of d30 4.56's

:cheers:

XJ gear Ratio ????

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