AA63-GTR Posted May 29, 2022 Share Posted May 29, 2022 Hi guys, would be interested to know if anyone has set up a TRD F series IRS diff. Specifically the side bearing preload. I have an MX73 open diff head. It had two washers setting the bearing preload. The Trd instructions specify to use new side carrier bearings, with some small shims under them which according to part number crossovers, I have the correct ones installed Once I drop the head in, I can not get the second washer in the gap to set preload, it's too tight. Now i can easily grind down the tight shim to get it fitting, but is this normal to do? Any help much appericiated. I have included a pic of the TRD instruction Quote Link to comment Share on other sites More sharing options...
Spencer Posted May 29, 2022 Share Posted May 29, 2022 You should be able to dig up a manual for a Celica or something that shows detailed setup of the F series diff. From memory there are various sized shims to set the preload, you probably want the correct ones rather than grinding them. When I did a LSD swap to a Altezza torsen LSD the stock shims just worked close enough luckily. Quote Link to comment Share on other sites More sharing options...
Valiant Posted May 29, 2022 Share Posted May 29, 2022 Are the side bearings pressed all the way home on the carrier? (I’ve seen it happen before) 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted May 29, 2022 Share Posted May 29, 2022 ^ yeah good call. Amazingly this manual I used to use in like 2007 is still online. Pretty sure like 99% of the time the washers on the old diff that come out end up doing the job. http://www.cygnusx1.net/Supra/Library/TSRM/MK2/manual.aspx?S=RA&P=32 Quote Link to comment Share on other sites More sharing options...
RUNAMUCK Posted May 30, 2022 Share Posted May 30, 2022 Some diffs require a casing spreader to get the carrier back in. Quote Link to comment Share on other sites More sharing options...
AA63-GTR Posted May 30, 2022 Author Share Posted May 30, 2022 Cheers guys. Yeah the bearings are all the way seated, looking at the instructions I have, I assumed that the standard shims would do the job. Would probably go in with the standard shims if I took the washers out under the bearings. But seems they are there for a reason. Quote Link to comment Share on other sites More sharing options...
johnny.race Posted May 30, 2022 Share Posted May 30, 2022 21 hours ago, RUNAMUCK said: Some diffs require a casing spreader to get the carrier back in. What he said ^ Near any rear loaded Salisbury type differential needs to be spread to fit those preload shims in without damaging them. You'll need to use a spreader in conjunction with an accurate DTI and work to spec or you run the risk of stretching the housing and it'll never preload right afterwards. It'll be fucked. 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted May 31, 2022 Share Posted May 31, 2022 Yeah you dont need a spreader here the manual is above, pretty simple. Quote Link to comment Share on other sites More sharing options...
AA63-GTR Posted May 31, 2022 Author Share Posted May 31, 2022 Thanks for the input guys. I'll figure it out. And thank you for the manual will definitely assist. Quote Link to comment Share on other sites More sharing options...
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