BA-10/5

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Top view of the BA-10/5

1 Peugeot BA-10/5
2 Found In
3 Specifications
4 Links / Swap out info

Peugeot BA-10/5

In 1987 Jeep released the YJ Wrangler. When ordered with the AMC 258 CI (4.2L 258 I-6), the YJ was equipped with a french made Peugeot BA-10/5 Transmission. Around the same

Comparison of the BA-10/5(left) to the AX-15(right). Note the larger housing of the AX-15. Photo courtesy of Richmond 88 YJ on Jeepforum.com

time, it was introduced into the XJ Cherokee & MJ Comanche. This was a light duty five-speed transmission. It looks similar to the AX-15, however is slightly smaller and its internal components are smaller in size when compared to later transmissions. The case bolts together along the mainshaft centerline in what's called the "clam shell" or "split case" design, opposed to the AX-15s axial/solid housing.

Despite the transmissions bad reputation, it is known to last a long time in street vehicles. If the vehicle never sees any hard off-road use, there's no reason to worry if you have one. Most serious off-roaders replace it with the later used AX-15, a much stronger trans, once the BA-10/5 breaks. See AX-15 swap link in the link's section below.

Quote from Novak's site:

The BA10 was found in Peugeot 504, 505, 604 cars. It may have delivered reasonable longevity in these platforms, but the demands of a Jeep truck are based more on torque than horsepower.

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Found In

YJ Wrangler - '87-March 9, 1989 mated to the NP207 from '87-mid '88 and the NP231 from mid '88-March 9,1989.
XJ Cherokee - '87-mid '89 behind the 4.0L I-6 "Renix".
MJ Comanche - '87-mid '89 behind the 4.0L I-6 "Renix".

NOTE: The BA-10/5 was replaced in the Wrangler March 10, 1989 when they retooled the assembly line for the AX-15. Shortly after that, the MJ and XJ lines followed suit.

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Specifications

Length (for Jeep models) = 16-7/8"
Fluid Capacity: 4.9 pints(2.45 QTs) of 80 weight gear oil but most recoment Redline MT 90 to protect the interals better
10 spline input shaft, 1 1/8" diameter
21 spline output shaft
slave cylinder is internal for all years and includes a hydralic throw-out bearing.