Pulls and installs the extension housing (tailshaft) bushing on GM 700R4, 4L60E, 200-4R, TH350 and Borg-Warner T5 cases without cracking the housing.
If your Silverado, S10, Camaro or older GM car keeps dripping fluid off the back of the transmission no matter how many rear seals you install, the seal is rarely the real problem. The bushing behind it has worn oval, the slip yoke wobbles, and the new seal gets chewed out within weeks. The T-0160 is a two-piece remover and installer for that rear case and extension housing bushing on GM rear-drive automatics including the 4L60E, 700R4, 200-4R and TH350, so you can change the bushing instead of just the seal.
The driveshaft slip yoke slides into the back of the transmission and rides on the rear bushing, not on the seal. The bushing keeps the yoke centered so the seal lip only has to seal, and it carries side load every time the driveshaft moves with the axle. In GM's 4L60-E overhaul procedure this is the case bushing, removed and installed with the J 8092 driver handle and J 34196-B bushing set, with the case rear oil seal coming out first and going in last. Once the bushing wears, the yoke runs off center, the seal lip is pushed to one side, and fluid walks out past it.
Pull the driveshaft and inspect the yoke. Clean and smooth means the bushing may be fine; a wear groove or one-sided polish means the bushing has let the yoke move. Slide the yoke back in with the shaft off and feel for slop. Also look at the yoke's seal surface: if it is grooved, replace the yoke too, because a new seal will not hold on a damaged surface. Check the fluid level hot and look for burnt fluid, since a long-running leak often hides bigger trouble inside. Our S10 4L60E problems guide walks through the leak-versus-internal-damage call on one of the most common platforms.
The T-0160 covers the GM automatic cases that share this tailshaft bushing size: TH180, TH200, 200-4R, TH350, 700R4 and 4L60E. It also fits the Borg-Warner / Tremec T5 (including World-Class T5) and NV1500 manual transmissions. The tool works with bushings from 1.500 in minimum inside diameter to 1.700 in maximum outside diameter, so if you have an unusual extension housing, measure the old bushing first. GM's own in-vehicle procedure for the 200-4R, 200 and 700R4 used a different factory tool, the J 38119, and this tool is the aftermarket way to do the same job. Shop the rest of the bench and service parts on our 4L60E parts page.
If you are doing a full rebuild rather than an in-car repair, pair it with the 13-piece GM bushing driver set for the pump, drum and sun gear bushings, and see our 4L60E bench tools guide.
| Reference number | T-0160 |
| Fits (automatic) | GM TH180, TH200, 200-4R, TH350, 700R4, 4L60E |
| Fits (manual) | Borg-Warner / Tremec T5, World-Class T5, NV1500 |
| Bushing range | 1.500 in min ID, 1.700 in max OD |
| Function | Extension housing bushing remover and installer |
| Material | Heat-treated steel |
| Weight | 1.98 lb |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yes. With the driveshaft and rear seal removed, the T-0160 pulls the old bushing and installs the new one with the transmission still in the vehicle. GM published an in-vehicle procedure for the 200-4R, 200 and 700R4 using the same approach.
Always. The seal has to come out to reach the bushing and is not reusable. Install a new one after the bushing is seated, and replace the slip yoke if its seal surface is grooved.
It is listed for the TH180, TH200, 200-4R, TH350, 700R4 and 4L60E plus the T5 and NV1500. The 4L80E and TH400 are not on that list. Measure your old bushing; the tool handles 1.500 in minimum ID to 1.700 in maximum OD.
The usual causes are a worn rear bushing letting the yoke move off center, a grooved yoke seal surface, or a seal driven in crooked. Replace the bushing, check the yoke, and seat the seal with a driver.
For a 4L60E use Dexron VI and check the level hot. Older GM units like the 700R4 and TH350 also take Dexron VI as GM's current replacement fluid.
