Mk1 Mr2 6 speed gearbox with or without LSD
Is your 5 speed gearbox giving trouble? Jumping out of gear or becoming whiney or notchy? Or are you just looking for a nice modern upgrade for your Mk1 Mr2 by giving it a fresh 6 speed gearbox?
We are happy to be able to offer a 6 speed upgrade for the Mk1, the gearbox can be supplied in either LSD form or with the standard open diff. With both options you will need to use Mk2 Mr2 NA driveshafts, but these are fully plug and play with the Mk1.
This gearbox upgrade will fit as a direct replacement for your stock 5 speed gearbox, there will be nothing to modify or change, just fit the new gearbox and you will instantly have 6 speeds.
This gearbox upgrade gives you much better ratios throughout the rev range and a much lower cruising RPM in 6th gear, it also increases the vehicle top end speed by 11%.
There is a fuel saving to be made as a result of the lower cruising RPM.
What you get.
I use a Celica Gen7 6 speed C60 trans, strip it right down, and refit the gears into a Mk1b C52 bellhousing (gives you two starter motor locations for use with either 16v or 20v swaps)
All gear cases are high pressure steam cleaned, new diff side bearings fitted to either your choice of stock C60 open diff or Torsen Helical LSD unit. The diff preload is checked and adjusted methodically and reshimmed to the top end of Toyota spec.
The gears are all inspected, and new Toyota input shaft and output shaft bearings are installed.
The input shaft oil seal and both diff output oil seals are renewed.
The whole trans is sealed and painted in whatever colour you like.
So you end up with a bearing and seal overhauled 6 speed trans that will bolt straight onto your 4a-ge engine without any modification whatsoever, your speedo cable will plug straight in, reverse light will plug in, all mountings will be OEM and the shifter assembly and slave cylinder will all just bolt up without any modification, truely plug and play. It will be a simple transmission swap no different than fitting another 5 speed.
If you are in the US i recommend getting the Sw20 NA axles from Mr2Heaven here New Sw20 axles
The 6 speed trans will then be carefully packed and shipped to your door within 2 weeks of ordering. (in most cases under 10 days from ordering)
The gear ratios will be as follows...
1st gear 3.166
2nd gear 1.904
3rd gear 1.310
4th gear 1.031
5th gear 0.864
6th gear 0.725
Final drive 4.312
Below is the approx speed in each gear with the new 6 speed, please allow a 5% variation due to different wheel and tire sizes.
The optional LSD unit
A 6 speed during rebuild.
This 6 speed conversion has been shipped and used all over the world and bolted to some very high HP 4a-ge engines in NA and boosted form, some in excess of 260bhp without a single issue.
If you have any questions about our 6 speed conversion please ask. This email address is being protected from spambots. You need JavaScript enabled to view it.
Checking out at £1450 does not include the LSD upgrade or Mk2 Mr2 axle upgrade or shipping cost, you will get the normal open diff if you checkout without emailing me, please email me to discuss all options and additional extras.
The LSD option is an additional £400 for the LSD unit itself, and we insist on using new Toyota side bearings with every LSD installation to ensure the highest possible quality, these two bearings are £180 for the pair. Please email me for LSD availability, thank you.