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 want the shifter for the ribcase gearbox, U-22A492.
(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 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.
Need Your Spridget Ribcase Transmission Rebuilt?
Question:
I have 1954 Morris Minor with a 948 cc Motor. Will this gearbox fit without any further modification? I have looked on some websites where they seem to think it will with a modified front cover.
The current gearbox is a smooth cover.
Answer:
Are you referring to this?: https://www.minimania.com/part/RJM1109E-MM/Transmission-Rebuilt-1275-Ribcase-Morris-Minor
If so, there's more to mating a ribcase to a 948 engine than just the front cover. It requires fitting a thick rear engine plate, too. This is to take up the distance of the longer
input gear. In some cases, it might be easier just to fit the later 1098cc engine and gearbox since those would already be a better complete upgrade.
Just be aware that all of the gearboxes have noise in 1st gear because it's a straight cut gear and it normally makes more noise.
If so, there's more to mating a ribcase to a 948 engine than just the front cover. It requires fitting a thick rear engine plate, too. This is to take up the distance of the longer
input gear. In some cases, it might be easier just to fit the later 1098cc engine and gearbox since those would already be a better complete upgrade.
Just be aware that all of the gearboxes have noise in 1st gear because it's a straight cut gear and it normally makes more noise.
Morris Mania Tech Team
The Morris Minor Parts and Accessories Experts
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 want the shifter for the ribcase gearbox, U-22A492.
(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 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.
Need Your Spridget Ribcase Transmission Rebuilt?
Question:
I have 1954 Morris Minor with a 948 cc Motor. Will this gearbox fit without any further modification? I have looked on some websites where they seem to think it will with a modified front cover.
The current gearbox is a smooth cover.
Answer:
Are you referring to this?: https://www.minimania.com/part/RJM1109E-MM/Transmission-Rebuilt-1275-Ribcase-Morris-Minor
If so, there's more to mating a ribcase to a 948 engine than just the front cover. It requires fitting a thick rear engine plate, too. This is to take up the distance of the longer
input gear. In some cases, it might be easier just to fit the later 1098cc engine and gearbox since those would already be a better complete upgrade.
Just be aware that all of the gearboxes have noise in 1st gear because it's a straight cut gear and it normally makes more noise.
If so, there's more to mating a ribcase to a 948 engine than just the front cover. It requires fitting a thick rear engine plate, too. This is to take up the distance of the longer
input gear. In some cases, it might be easier just to fit the later 1098cc engine and gearbox since those would already be a better complete upgrade.
Just be aware that all of the gearboxes have noise in 1st gear because it's a straight cut gear and it normally makes more noise.
Morris Mania Tech Team
The Morris Minor Parts and Accessories Experts
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