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| Getrag transmission problem on low mileage Fiero GT (Page 4/17) |
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Moar
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OCT 29, 01:33 AM
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I think I will go the following way:
- First I need to rebuild the engine and make it ready for the swap.
Currently my 3.4PR looks like **** (comes from a Firebird donor car with engine fire)
- Then I´ll remove the cradle with the stock engine on it.
- Degreasing, derusting and re-painting the cradle and suspension parts
- Rebuilding the MG-282 tranny (or if I can find a F23 I may chose this as alternative)
- Finally, putting all back together…
Of course, I´ll not misuse my car and make any clutch dumps with Nitrous! 
I will also not participate in drag races.
Alas drag races are not common in Austria, I even don´t know where drag races take place here.
Regarding tires, I´m currently using 255/35 tires on 18x10.5 rims in the rear.
In future I may upgrade to max. 265 mm tire width (maybe I can find well-priced street legal semi-slicks).
My current tires are normal non-slick tires, because slick tires are strictly prohibited in Austria!
However, even the 255 tires have quite a lot of grip which means increased load for the transmission.
Smaller tires may be safe for the transmission, but I don´t wanna get too much wheel spin after the engine swap.
Under these conditions you think this shouldn´t be a big problem for the Getrag MG-282?
If I decide to rebuild the stock tranny, then I´ll also install these add-on needle bearings in
order to support the diff bearings.[This message has been edited by Moar (edited 10-29-2015).]
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Gall757
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OCT 29, 07:40 AM
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The 282 will be fine. You should find new output (diff) bearings, which are rare, but sometimes available in a rebuild kit. I don't think you will need the extra needle bearings. [This message has been edited by Gall757 (edited 10-29-2015).]
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hobbywrench
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OCT 30, 11:39 AM
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Eleven years back I made some notes on Getrag part numbers. At that time the diff bearings were noted as JL69349/10 (K-18) , GM 9437733.
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Moar
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OCT 30, 01:21 PM
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Moar
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OCT 30, 01:56 PM
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Maybe replacing the main shaft bearing (on pinion side) would be also a good idea?
Source: http://www.realfierotech.co...opic.php?f=3&t=16381
I´m referring to the red marked bearing on the right-hand side in above schematic drawing.
On this side the pinion gear meshes with the diff gear (last gear mesh), therefore this bearing is under very high loads.
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hobbywrench
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OCT 31, 10:04 AM
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The notes say the red outline , output bearing front , is LFS 70922 (kit) , plus I wrote down FAG 563271 A German, and GM 8681381. That bearing is a blind one. The cup was removed with 275F for 25 minutes in the kitchen oven. It drops out. Regarding wear. Besides the usual problems (gall, chip, brinell etc) it is a judgement call. I did not find any obvious defects on any bearings in the two units I looked at. [This message has been edited by hobbywrench (edited 10-31-2015).]
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Moar
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OCT 31, 03:56 PM
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hobbywrench
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NOV 01, 11:10 AM
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I did not replace the sleeve, but I tried with no source as confirmed in this forum. The kit is a good buy. I used everything in it, but , as stated, I did not see anything inside the rebuild unit that was worn except the synchros. And the unit was from an unknown Fiero, so who knows how it was treated. BTW these sychros (5) are typically $50 , the kit $250 here. The best GM source I found 11 years back was "newgmparts.com," 800-858-1977, Mass USA. Fast, accurate (for ref their quote for 5 sychros: $315).
Edit: I consider whether there is enough interest here for me to post every PN I found back then? The way we're going it is happening slowly.[This message has been edited by hobbywrench (edited 11-01-2015).]
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Moar
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NOV 02, 06:23 AM
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I think I´ll buy the rebuild kit #BK234(WS), because I have already found a very good offer on eBay (only $90)!
Obviously diff. bearings are not included in this kit, therefore I need to buy them separately (2x SKF BR11).
You have already posted most important part numbers here (for a Getrag bearing rebuild).
These part numbers may be also helpful for other PFF members with a manual 5-sp. Fiero.[This message has been edited by Moar (edited 11-02-2015).]
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Rodney
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NOV 02, 09:12 AM
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Unless I'm wrong that BK234 kit from Auto Zone has been out of stock for like 10 years now? ------------------
Rodney Dickman
Fiero Parts And Acc's Web Page:
All new web page!:www.rodneydickman.com
Rodney Dickman's Fiero accessories
7604 Treeview Drive
Caledonia, WI 53108
Phone/Fax (262) 835-9575
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