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BMW Mini Cooper
Transmission Rebuilt 1275 Ribcase , Sprite & Midget

Transmission Rebuilt 1275 Ribcase , Sprite & Midget

Transmission Rebuilt 1275 Ribcase , Sprite & Midget

Transmission Rebuilt 1275 Ribcase , Sprite & Midget

Transmission Rebuilt 1275 Ribcase , Sprite & Midget
Part No: RJM1109E
Internet Price $1694.95
This Item has a $350.00 core charge.

This ribcase transmission comes with a modified front cover and an upgraded seal.

NOTE: If exchanging smoothcase to a ribcase, the shift lever is different.  You will need a ribcase shift lever part number: U-22G1397.
(Remember: it runs straight SAE 30 weight motor oil for lubrication- not gear oil)

The ribcase gearbox is the strongest of boxes for the Sprite, Midget and Morris Minors application and can be one of the most dependable parts of your car. These boxes use real bearings in all the critical places (in contrast to the 'smooth case' box that uses simply bushes).

The ribcase is a direct replacement for the smooth case of old and will provide a much improved gear ratio set. The first gear is taller and thus much more comfortable and usable to drive.

And stop believing that every ribcase will pop out of second gear! We believe the reputation of the Spridget gearbox has been severely hurt by rebuilders that don't know how to do it right!

All of our gearboxes are built in house! We even disassemble those we might buy as rebuilt from the UK and FIX them right! They are Guaranteed to be good and we promise, THEY WILL NOT POP OUT OF SECOND GEAR!

These are sold with a core charge to ensure our supply of ribcases to rebuild. You might also consider our rebuilding service if you have the time. The standard service requires that you send us your gearbox (easily shipped by UPS), we do a complete inspection and provide a quote for rebuilding it.

 Returned Core must be Ribcase to qualify.

Related Technical Articles:
Vintage Racing with a “Ribcase” transmission
Created: April 19, 2018
The world of Vintage racers seem to be ever expanding and so does the use of the venerable Ribcase transmission. A set of Close Ratio Straight cut gears can make a big difference in performance and driving pleasure.
Common Ribcase transmission problems
Created: April 24, 2014
The "Ribcase" acronym for the gearbox as found as stock in most later '60's and '70's. The original design parameters were conceived around a small displacement low torque and horsepower engine and the "Smooth-case" transmission. The demands on this gearbox were well within design limits. Over the years the engines got bigger and bigger as did the weight of the cars they were installed in.
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