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Jeep TJ Common Transmissions

NSG 370 6 Speed

NV 3550 5 Speed

NV4500 5 Speed

Jeep Standard Transmissions

 

 

 

Trans

1st

2nd

3rd

4th

5th

6th

Rev

AX-5

3.93

2.33

1.45

1

0.85

NA

4.74

AX-15

3.83

2.33

1.44

1

0.79

NA

4.22

NV 3550*

4.01

2.33

1.39

1

0.78

NA

3.57

NSG-370**

4.46

2.61

1.72

1.25

0.01

0.84

4.0

 

 

 

 

 * Mfg. Torque Rating: 300 ft. lbs, 2000 - 2004 4.0L Jeep TJ

** Mfg. Torque Rating: 270 ft. lbs, 2005 - '08 Jeeps 4.0L/3.8L V6, TJ

NV3550 Specs: 

Dry weight: 97 lbs.
Oil capacity: 2 liters
Rated GVW: 7200 lbs.
Length (OAL from Engine to Tcase) 24" (incl Bellhousing & Tcase adapter)
Case material: cast aluminum
Input shaft & spline 1-1/8" 10 spline 


Lubrication:  Jeep/Dodge have a part number for Lubricant for the NV3550:  4874464    It uses about 2.2 qts. NOTE: It is NOT recommended to use ATF in this trans.







NV4500:

A fully synchronized (except reverse) five-speed gearbox with all of the strength and low-gear benefits of the older granny-low four-speeds, with a 27-percent overdrive. The cast iron case is combined with massive gear sets in an almost compact 200lb package. 

Gear Ratios:

Current production Dodge NV4500 and GM NV4500 share the same gear ratios. Early GM units (93-94) were built with a lower first gear ratio of 6.34 to 1.0. These low-geared GM boxes have since been discontinued and are generally much more difficult to obtain. 

Beginning in 95’, all GM units were built with the same gear ratios as the Dodge unit.

GM 93-94 95/up GM; 93/up Dodge
First Gear 6.34 5.61
Second Gear 3.44 3.04
Third Gear 1.71 1.67
Fourth Gear 1.00 1.00
Fifth Gear 0.73 0.73
Reverse 6.34 5.0

NV 4500 Specifications:

Dry weight: 195 lbs.
Oil capacity: 1 gallon
Rated GVW: 14,500 lbs.
Case material: cast iron

Dimensions:

NV4500 GM (6.34) GM (5.61) Dodge Dodge HD
Main case 12.375" 12.375" 12.375" 12.375"
4WD Adapter Housing 8.125 8.125 6.25 6.25
2WD Tailhousing 6" Tailhousing 6" Tailhousing 13" Tailhousing 13" Tailhousing
Yoke Fixed Yoke Fixed Yoke 30 spl Slip yoke 31 spl Slip yoke


Lubrication:

You MUST use the correct synthetic lubricant. The GM part no. for the correct oil is 12346190 (quart). The Dodge part number for the same oil is 4874459   Use of ANY other oil in the NV4500 will lead to failure and also voids any chance of a warranty claim.

Additional Info: Syntorq LT SAE 75W-85, API GL -4 is a premium high performance, synthetic gear lubricant for synchronized manual transmissions. Syntorq LT is available through General Motors (Part #12346190) and Chrysler (Part #4637579) dealerships.

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