Eaton Detroit Truetrac Differential GM1500 9.5in/9.75in/3.42in/3.73in 33T
A 2014-2019 Silverado 1500, Tahoe, Yukon or Escalade that spins one rear tire on a wet boat ramp, or a truck whose factory G80 locker has started to bang and chatter, is exactly what the Eaton Detroit Truetrac 917A732 is meant for. It is the helical-gear limited slip for the GM 9.5 and 9.76 inch rear axle that GM introduced with the 2014 trucks, with 33-spline axle shafts and 3.42 or 3.73 ring and pinion ratios. It goes in quietly, needs no driver input and has nothing inside that wears out like a clutch pack.
Inside the steel case, sets of helical pinion gears ride in pockets and mesh with helical side gears splined to the axle shafts. Driving straight or turning normally, the gears let the tires turn at different speeds just like an open differential. When one tire starts to slip, the gear tooth loads push the pinions hard into their pockets, and that friction transfers torque to the tire with grip. Unlike the factory G80, which waits for a speed difference, then slams a clutch pack together, the Truetrac biases torque smoothly and continuously, which is why towing owners like it on slick ramps and gravel.
First confirm the axle. The 2014-up 9.5/9.76 uses a 12-bolt cover, while the earlier GM 9.5 semi-float uses a 14-bolt cover and needs a different carrier. Next read the ratio from the RPO axle code on the Service Parts Identification label or from the axle tag: this part is cataloged for 3.42 and 3.73 only, so a truck with another ratio needs a different carrier unless you regear. If you are chasing a noise rather than a traction problem, our GM 9.5 / 9.76 12-bolt problems and rebuild guide walks through bearing whine versus G80 failure. To compare a gear limited slip with clutch-type units and full lockers, read open vs limited slip vs locker; the clutch-type alternative for this axle is the Yukon Dura Grip for the 2014-up GM 9.5/9.76.
Revolution Gear's fitment list for 917A732 covers the 2014-2019 Chevrolet Silverado 1500, Tahoe, GMC Yukon and Cadillac Escalade, the 2016-2019 Suburban, 2014-2019 Express 2500 and Savana 2500 vans, and the 2014 Savana 1500. That list does not name the GMC Sierra 1500 or 2019-up new-body trucks, so if you have one of those, or any doubt, send us your year, VIN and RPO axle code and we will confirm it. Spline count must be 33. You can see other axle parts in our hard parts category.
Remove the cover and drain, pull the cross pin and C-clips, slide the shafts out and lift the carrier. Press off the carrier bearings, move the ring gear over with new bolts and thread locker, and install new carrier bearings; the Yukon master overhaul kit for the 2014-up GM 9.5 12-bolt carries bearings, shims and seals. Eaton warns that the factory oil drain plug may need relief grinding for the Truetrac to clear, so trial-fit before final assembly. Re-check backlash after the swap; Yukon's chart lists 0.006-0.011 inch for a five-cut gear set and 0.004-0.008 inch for two-cut gears on the AAM straight-axle 9.5 and 9.76. Eaton specifies a petroleum-mineral GL-5 80W-90 gear oil and says not to use synthetic oil or friction modifier with this unit. If you plan to regear, a 3.42 Yukon gear set for the 2014-up 9.5 stays inside this carrier's ratio range.
| Brand | Eaton |
| Part number | 917A732 |
| Fits | Eaton Detroit Truetrac Differential GM1500 9.5in/9.75in/3.42in/3.73in 33T |
| Type | Differentials |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. Pre-2014 GM 9.5 axles use a 14-bolt cover and a different carrier. This Truetrac is for the 2014-up 9.5/9.76 with the 12-bolt cover.
Eaton catalogs 917A732 for 3.42 and 3.73 ratios only. With another ratio, ask us for the matching Truetrac part number or regear to 3.42 or 3.73.
No, the Truetrac replaces the whole carrier, whether it is the open unit or the G80. The G80 governor and clutch packs come out with the old case.
Eaton calls for a petroleum-mineral GL-5 80W-90 and says not to use synthetic oil or friction modifier with this Truetrac.
On some axles the factory drain plug sticks far enough into the housing to touch the Truetrac case. Eaton says it may need relief grinding, so check clearance by rotating the carrier before you fill it.
