AX15 TRANSMISSION: (New Transmission)
The AX15 transmission has always been a great transmission able to handle the torque and horsepower of most V8s. The biggest problem has always been the availability of new units. With the lack of availability of a new NV3550, we revisited the possibly of obtaining the Aisin Warner AX15 transmission and were successful. Although the torque specifications are not listed on this transmission in any service manual, we feel it‘s similar enough to the NV3550. The NV3550 was the transmission that superseded the AX15; and Jeep used the same engine with the same vehicle ratings. With the availability of AX15 transmissions, we can now offer some additional transmission retrofit applications. Shift handles are sold separately.
New AX15 transmissions (23 spline output) that come with a 1 year warranty. 26-AX15
The AX15 can be used in multiple vehicles. The most common are the Jeep and Bronco; however, this transmission is easily adapted to most transfer cases we work with.
JEEP APPLICATIONS for The AX15 & NV3550:
Direct Replacement Jeep YJ & TJ: The AX15 was used in Jeep vehicles used between 1988 to 1999, and the NV3550 between 2000 to 2004. With these Jeeps getting up in mileage a new AX15 would be your direct replacements. The AX15 is available in both an internal and external release bearing design. And because the AX15 and NV3550 are the exact same dimensions, you can replace a NV3550 with a AX15.
Replacing the AX5 (AX15 Only): This kit is for all 4 cylinder Jeeps 1987 to 2002. The AX5 is considered a light duty transmission compared to the AX15. Jeeps equipped with larger tires and lower gears in the axle & transfer case may find the weak link in the drivetrain is the stock transmission. You can now install the AX15 in place of the AX5 to gain some drivetrain strength. The nice thing is that when you’re ready to replace the 4 cylinder with a larger V6 or V8, the AX15 is an ideal transmission for the power increase. We offer 5 complete kits to fit the different Jeep applications:
27-AX15A AX15 TO 4CYL YJ NP207 TC INTERNAL RELEASE
27-AX15B AX15 TO 4CYL YJ NP231 TC INTERNAL RELEASE
27-AX15C AX15 TO 4CYL YJ NP231 TC EXTERNAL SLAVE
27-AX15D AX15 TO 4CYL YJ LATE MODEL NP231 TC EXTERNAL SLAVE
27-AX15E AX15 TO 4CYL TJ NP231 TC EXTERNAL SLAVE
Replacing the Peugeot 5sp. The AX15 & NV3550 are ideal replacements for this light-duty transmission. The kits we offer include a new input gear for either the New Process 231 or 207 transfer case. Due to vehicle variances, some applications may require transfer case linkage modifications. The adapter kits are sold either with or without a transmission. Kits include a new bellhousing, transfer case shifter linkage, crossmember adapter mount that retains the stock Peugeot rubber mount, slave cylinder kit, and an input gear for your transfer case.
27-3507AX15 - AX15 TO BA10 NP207 (Trans Included)
27-3510AX15 - AX15 TO BA10 NP231 (Trans Included)
27-3507AA - NV3550 & AX15 TO BA10 NP207 KIT
27-3510AA - NV3550 & AX15 TO BA10 NP231 KIT
1980-86 Jeep replacements: We offer the adapters for replacing the stock Jeep T5, T4, SR4 and T176 transmissions found in Jeeps 1980-86. The overall length of the new transmissions are 16.75" long, and most bellhousings we offer for this transmission are 7.500" long. Therefore, most applications will require driveline modifications. When installing the Dana 300 you may be required to modify your transfer case shifter. The adapter plates use a stock T150/T176 bellhousing or AA P/N 712599.
712543J - AX15 adapter plate to 1976-86 AMC bellhousing
712545 - NV3550 adapter plate to 1976-86 AMC bellhousing
AX15/NV3550 4.0L & 4.2L Jeep Bellhousing: We offer a full bellhousing to fit both the 4.0L & 4.2L stock 6 cylinder (with hydraulic clutch linkage).
712590 -AMC 4.0L & 4.2L engine to AX15/NV3550 (This bhsg. will only work with the slave cylinder listed below)
716340 -Slave cylinder kit for the AX15/NV3550 using 712590 bellhousing
716210 -Stock AX15 bearing retainer with snout for release bearing.
Bronco Dana 20 Applications for The AX15 and NV3550:
These transmissions are ideal transmission swaps for the early Broncos. The weight of these 5 speeds is similar to the stock 3 & 4 speed transmissions. The overall size and length make it an ideal fit. The gearing of these 5 speeds is as follows:
AX15 is 1st 3.83:1; 2nd 2.33:1; 3rd 1.44:1; 4th 1.00:1; 5th 0.79:1, and Reverse 4.76:1.
NV3550 is 1st 4.01:1; 2nd 2.32:1; 3rd 1.40:1; 4th 1.00:1; 5th 0.78:1, and Reverse 3.57:1.
The transfer case adapters we manufacture for these transmissions use an adapter plate and spud shaft. The adapter plate offers two rotation options for the Dana 20 transfer case: the stock rotation which is 42 degrees and a higher rotation of 34 degrees. The higher rotation may require a body lift for proper clearance. The transfer case adapter comes with a transfer case shifter linkage bracket which only fits the “T” style shifter.
The stock Ford bellhousing will also need to be adapted. The NV3550 and the AX15 have a 7-1/2” long input shaft. We manufacture an adapter plate that bolts to the front of this transmission. This adapter provides you with the proper indexing and bolt pattern to couple to the stock bellhousing. When bolting to the NV3550, the stock bellhousing requires some slight modifications. The stock pressure plate and release bearing are retained and a new 1-1/8” 10 spline clutch disc is used.
The new crossmember for the NV3550/AX15 transmission must also be used. Since these 5 speeds do not offer the angular support pads, and our adapter is too short to have these provisions, we designed a new crossmember support for the new transmission. Our new crossmember bolts to the stock crossmember frame hole and includes a new rubber support. The crossmember is designed to fit both stock exhaust and header applications.
* 50-9920A - AX15 to Bronco Dana 20 T/C adapter (1.40” long)
* 712543 -AX15 to Ford bellhousing 4.848” index (adapter length 7/8”)
* LC383735 -1-1/8” 10 spline clutch disc
* 716000A -AX15 Crossmember support
27-3520AX15 -AX15 BRONCO DANA 20 KIT (*includes all parts listed above plus a shift handle ** no transmission**)
27-3525 -AX15 TRANSMISSION & BRONCO DANA 20 ADAPTER KIT (Trans Included)
* 50-9920 -NV3550 to Bronco Dana 20 T/C adapter (1.40” long)
* 712544 -NV3550 to Ford bellhousing 4.848” index (includes clutch)
* 716000 -NV3550 Crossmember support
27-3520AA -NV3550-BRONCO DANA 20 KIT (*includes all parts listed above plus a shift handle)