Bayrat

I'm in the process of pricing out another Jk and wondered who manufacturers the six speed. That is what I currently have in the Rubi but would like to go automatic due to the miles we drive.

Having seen so many Chrysler automatics bite the dust over the past few years I am wondering if the Jeep JK autos are holding up. May be too early to tell. If the six speed it not made by Chrysler, I would like to know who does make it, can't find any info on the net.

whtIwrk4

It is a Mercedes tranny. Doesn't really mean much, though.

jeep08ham

I have overhauled lots of trannys over the years. Biggest problem with all transmissons is the wrong oils used and then not changing often enough. Second item is overheating. On the Jeeps and Chrysler products I always use the oil that they recommend. A few dollars well spent. When I got my JK Rubi, I knew I would be doing some crawling with it. First mod was a tranny oil temp gauge. You can not imagine how quick the oil heats when crawling in low range. It goes hot really quickly. Every engine oil change, check the trans. oil level and smell it. If it is discolered or smells a bit burnt, change oil and filter with recommended fluids. I personally have never had a Chrysler auto, trans. let me down but I change fluids and filters on a regular basis!

JulietKilo

AS FOR THE MANUAL sourced from Mercedes (Mercedes Benz Sprinter Van gear box)

NSG 370—Manual, Six-Speed Overdrive
Availability Standard—All models
Description Synchronized in all forward gears and reverse, multirail shift system with top-mounted shift lever
Clutch Hydraulic actuation
Gear Ratios 1st 4.46
Gear Ratios 2nd 2.61
Gear Ratios 3rd 1.72
Gear Ratios 4th 1.25
Gear Ratios 5th 1.00
Gear Ratios 6th 0.84
Gear Ratios Reverse 4.06
Axle Ratio 3.21 Std., 4.10 Opt. (Std. on Rubicon)
Overall Top Gear 2.69 Std., 3.44 Opt. (Std. on Rubicon)

AS FOR THE AUTO Manufacturer Chrysler Corporation
DaimlerChrysler
Also called 41TE/A604
41AE/A604
42LE/A606
42RLE
40TES
41TES
62TE
Production 1989-present
Predecessor A670
Class 4-speed automatic
Related PowerFlite


42RLE—Automatic, Four-Speed Overdrive

Availability Optional
Description Electronic governor, electronically controlled converter clutch
Gear Ratios 1st 2.84
Gear Ratios 2nd 1.57
Gear Ratios 3rd 1.0
Gear Ratios 4th 0.69
Gear Ratios Reverse 2.21
Axle Ratio 4.10
Overall Top Gear 2.83

GreytSilly

Isn't the six speed actually built by Getrag?

Never mind, I found it, the Getrag is in trucks, it's the 238.

Bayrat

So the granddaddy of the auto is that original four speed installed in the late 80's in most of Chrysler's lineup. Hopefully all the bugs have been worked out, that is what I am looking to buy.

skibum

The bugs have most definitely NOT been worked out of the auto. Search the forum for auto trans issues, 42RLE, etc. All kinds of TC problems, overheating problems, Chrysler customer service problems, etc. Buy the manual tranny.

RedneckJeep

Yes, it's a Benz sourced transmission for Chrysler. Here's a tad more info:

http://en.wikipedia.org/wiki/Chrysle...0_transmission

JulietKilo

That is where I found out it was mercedes as well as some other sites. I then got the gear ratios and other info from Jeep site sources.