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Our new active profile dog engagement gear kit for the Sprite and Midget. A complete and extremely comprehensive gear kit with all four gears now having dog engagement for a super slick gear change. We have upgraded the layshaft bearings in both diameter and quantity now with 2 needle roller bearings in either end of the laygear. The 1st / 3rd needle bearing diameter has also been increased in size for added strength to this susceptible area of the gearbox. Ratios are as follows, 1st 2.380 2nd 1.629 3rd 1.190 4th 1.1 The kit comes complete with the following:
  • complete mainshaft assembly
  • reverse gear
  • reverse gear shaft
  • laygear cluster
  • competition layshaft
  • all needle bearings
  • front main bearing
  • rear main bearing
  • 1st / 2nd alloy selector fork
  • 3rd / 4th alloy selector fork
  • reverse selector fork
  • selector shaft spacers
Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget

Dog Engagement Ribcase Gearset, Sprite & Midget
Our new active profile dog engagement gear kit for the Sprite and Midget. A complete and extremely comprehensive gear kit with all four gears now having dog engagement for a super slick gear change. We have upgraded the layshaft bearings in both diameter and quantity now with 2 needle roller bearings in either end of the laygear. The 1st / 3rd needle bearing diameter has also been increased in size for added strength to this susceptible area of the gearbox. Ratios are as follows, 1st 2.380 2nd 1.629 3rd 1.190 4th 1.1 The kit comes complete with the following:
  • complete mainshaft assembly
  • reverse gear
  • reverse gear shaft
  • laygear cluster
  • competition layshaft
  • all needle bearings
  • front main bearing
  • rear main bearing
  • 1st / 2nd alloy selector fork
  • 3rd / 4th alloy selector fork
  • reverse selector fork
  • selector shaft spacers
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Related Technical Articles:
Classic Mini Cooper Synchromesh Transmissions vs Dog engagement
Created: April 25, 2014
Dog engagement is typically limited to racing applications where fast, precise shifting is needed. Dog gear engagement works by having numerous large teeth or ‘dogs’ that mate into matching openings machined into the opposite surface of the drive gear. Unlike the synchro engagement, there is no synchronizing mechanism to assist in equalizing speed.
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.