Gearbox query
27 June 2020, 10:50 PM
#1
Scooby Newbie
Thread Starter
Gearbox query
I’ve had mixed responses to this so I thought I’d ask here too.
my box has just gone bang, (3rd gear) and basically I need to sort it.
all I’m wandering, Is am I right in saying that if I keep my diffs, but just change the gears/shafts/front housing, am I safe to do that?
keeping my diffs means they’re all still paired and sat at the 4.1 ratio, so surely replacing the gears inside wouldn’t make a difference if they were from a different model? Or am I talking ***t?
thanks!
Edit: for example, my box was a 9S-TY752VBCBA but I’ve found a box with code 6C-TY752VB3FA. Would the front half of the box bolt straight onto my diff? Or given that both of them are 4.11, would it just fit and work?
thanks
my box has just gone bang, (3rd gear) and basically I need to sort it.
all I’m wandering, Is am I right in saying that if I keep my diffs, but just change the gears/shafts/front housing, am I safe to do that?
keeping my diffs means they’re all still paired and sat at the 4.1 ratio, so surely replacing the gears inside wouldn’t make a difference if they were from a different model? Or am I talking ***t?
thanks!
Edit: for example, my box was a 9S-TY752VBCBA but I’ve found a box with code 6C-TY752VB3FA. Would the front half of the box bolt straight onto my diff? Or given that both of them are 4.11, would it just fit and work?
thanks
Last edited by Alp123; 27 June 2020 at 11:01 PM.
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28 June 2020, 10:48 AM
#3
Scooby Newbie
Thread Starter
Believe it or not, I am actually a mechanic so I know what I’m doing, but I work in a nice plush dealership on brand new vw group cars, so as you can imagine, Subaru’s are a massive learning curve for me and I’m loving it!
I should manage ok with that shaft, is there anything particular to check on them? Or is it obvious when I open it up?
thanks!
28 June 2020, 12:29 PM
#4
Basically remove tail case split box check bearings etc as you do. Lift the two shafts out there's locating dowels in the casing to locate the shafts if you know your front diff is different change your pinion shaft over and screw it all back together. The box splits with the N/S casing pointing towards the ground you shouldn't even have to lift your front diff out apart from to clean it. A new nut for the pinion shaft could be advisable.
You'll then need to check your backlash but if you've only changed the pinion shaft and used everything else of your own it shouldn't be far away.
You'll then need to check your backlash but if you've only changed the pinion shaft and used everything else of your own it shouldn't be far away.
Last edited by 1509joe; 28 June 2020 at 12:37 PM.
28 June 2020, 02:51 PM
#5
Scooby Newbie
Thread Starter
Basically remove tail case split box check bearings etc as you do. Lift the two shafts out there's locating dowels in the casing to locate the shafts if you know your front diff is different change your pinion shaft over and screw it all back together. The box splits with the N/S casing pointing towards the ground you shouldn't even have to lift your front diff out apart from to clean it. A new nut for the pinion shaft could be advisable.
You'll then need to check your backlash but if you've only changed the pinion shaft and used everything else of your own it shouldn't be far away.
You'll then need to check your backlash but if you've only changed the pinion shaft and used everything else of your own it shouldn't be far away.
mill get on it Monday and hopefully it’ll all come to me!
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