hi people just had gearbox fitted because i lost 3rd gear, i drove it away from workshop all fine , 2 mile down the road n it felt like my rear wheels where going to fall off, the car viabrated so severely i pulled over n it clonked as i slowed down, went to drive away and it was fine , goes in gear fine no whining just that.. it done it twice so drove it back to the workshop ...but what was that ? i checked gearbox codes n the final diff ratio is the same 4.111 but the only diffrence is its an sti box mine is uk... mine car box originally ty752vn6aa this one ty752vb4aa the gear ratios are diffrent does this make a diffrence help pleaseeeee

 

You have the wrong box fitted, It will only end in scrap (if its not aready) if you dont change it for a correct ratio one or swap out the rear diff to one that matches the box.

 

those boxs dont have the same ratio, vn code and vb code is different

 

I had a similar problem mate when i changed out my box for a jap sti version and it felt like the brakes where on when i pulled out of my yard,alot of binding going on so i went back to work after 500 yards and have replaced diff with sti diff and all's well.
I wouldn't like to say it would have been ok if i had driven further though so i wouldn't drive your's any more as it could have done severe damage already after a couple of miles!

 

Are you sure the box fitted is 752 and not 754? The VN is a UK box with a rear diff ratio of 3.54 ie. final drive of 3.9 and drop gears ratio of 1:1.1 giving rear diff ratio of 3.54.

The ty752vb4aa box looks to have a final drive ratio of 4.11 with 1:1 drop gears giving a rear diff ratio of 4.11.

So looks like these guys have no idea what they are doing and you now have a mismatched box and diff. The upside is an R160 3.54 rear diff is prob the easiest to get hold of all UK newage cars and the late UK classics with TY754VN... boxes all have 3.54 rear diffs.

 

cheers lads i looked at the ratio chart and they have same diff ratio ...but obv not i have brought the matching diff now and is being fitted over the this week so just hope all is well thanks again people

 

how do i get the little subaru under my name guys lol