Left and right engine mounts plus the transmission mount for 1994-2005 Chevy Astro and GMC Safari 4.3L V6 rear-wheel-drive vans with the 4L60E.
A Chevy Astro or GMC Safari that clunks when you drop it into drive or reverse, lurches when you step on the gas, or shakes the dash at idle often has nothing wrong inside the transmission at all. Worn mounts let the 4.3L V6 and 4L60E move as one block, and that movement feels like a harsh engagement. This kit replaces all three: the front left engine mount, the front right engine mount and the transmission mount, for 1994-2005 rear-wheel-drive vans.
In the Astro the 4.3L Vortec sits back under the doghouse cover, with the 4L60E bolted behind it. The two engine mounts hold the front of the powertrain to the frame and resist the twisting force of the engine under load. The transmission mount sits on the crossmember under the tailshaft and carries the rear of the package. When the rubber in any of them cracks or collapses, torque reaction lifts the engine on one side and the transmission rocks on the crossmember. The van then bangs into gear, the shifter or throttle linkage can move with the engine, and the driveshaft angle changes every time you accelerate or back off.
With the doghouse cover off, set the parking brake, hold the service brake hard and have a helper briefly shift between drive and reverse with light throttle. A good mount lets the engine move only slightly; a broken one lets it jump or separates the rubber from the metal. Under the van, pry gently between the transmission mount and the crossmember. Keep in mind a 4L60E can also engage harshly on its own, for example when the pressure control solenoid is not being commanded and line pressure goes to maximum. If the mounts are tight and the bang remains, work through our Astro 4L60E shift problems guide and the Astro common problems guide before buying internal parts.
This kit fits the 1994-2005 Chevrolet Astro and GMC Safari with the 4.3L V6 in rear-wheel drive only. All-wheel-drive vans use different mounting, so this kit is not for them. Listed reference numbers include A2436, A2879, 2435, 2879, EM-2436 and EM-2879; match those against your old mounts, or send us your year and VIN and we will confirm. Earlier Astros through 1993 used the 700R4 and 4L60, and this kit is not listed for them. More parts for this transmission are in our 4L60E collection.
If the transmission is coming out for service anyway, do the mount at the same time. A 1993-2003 overhaul master rebuild kit covers a tired unit, and a 1993-2002 pressure control solenoid is the usual fix when harsh shifts continue after the mounts are fixed.
| Fits | 1994-2005 Chevrolet Astro and GMC Safari 4.3L V6, RWD |
| Includes | 1 front left engine mount, 1 front right engine mount, 1 transmission mount |
| Reference numbers | A2436, A2879, 2435, 2879, EM-2436, EM-2879 |
| Manufacturer part number | JFBAJCWEM00362K3 |
| Kit weight | 6.13 lb |
No. The kit is for 1994-2005 rear-wheel-drive Astro and Safari vans with the 4.3L V6. All-wheel-drive vans use different mounting hardware.
Yes. When the mounts are worn, the whole powertrain moves as you shift into drive or reverse, and that feels like a harsh engagement. Check the mounts before you replace solenoids or rebuild the transmission.
One front left engine mount, one front right engine mount and one transmission mount. Fasteners and fluid are not listed as included.
Not always, but when one mount fails the others have usually taken extra load. Replacing all three restores even support and avoids a second job a few months later.
GM lists DEXRON-III for the 2003 Astro, with a 5.0 quart drain-and-refill. Current Dexron VI is the GM replacement for earlier Dexron fluids. Check the level hot after any work.
