HM290

The HM290 is the Getrag five speed manual listed by GM as the NV3500. All six units here are remanufactured HM290 manual transmissions for GM trucks and vans, and every one of them carries the note NV3500; Getrag HM290 in its application data. They sit under Transmissions and Manual. They separate on shift mechanism, slave cylinder location and speedo hole size, so match those before the year.

What fits what

Coverage runs from 1988 to 2007. For pickups there is a unit for 1999-2007 Silverado and Sierra 1500 4×4, a 1996-1998 1500 listed as 4X2, and a 1988-1992 C1500 and C2500 unit. For vans there is a 1996-1998 Van 1500 and 2500, a 1993-1995 Van 1500 and 2500 4×4, and a 1988-1992 Van 1500 and 2500 listed as 2WD. Two listings note that ratios may vary, so confirm the ratio with us rather than assuming it from the year.

How to identify yours

Every one of these has an integral bell housing. The first split is the shift mechanism: the two 1988-1992 units use a 3 rail internal shift mechanism, and the rest use a single rail internal shift mechanism. The second split is the slave cylinder. The 1999-2007 Silverado and Sierra unit and both 1996-1998 units have an internal slave cylinder; the 1993-1995 van and both 1988-1992 units have an external slave cylinder. The two 1988-1992 units share Hollander number 400-02254A and are told apart by speedo hole size, 7/8 inch on the van and 2 inch on the C1500 and C2500. Other Hollander numbers are 400-04283 for the 1999-2007 unit, 400-02939 and 400-02940 for the 1996-1998 van, 400-02934 and 400-02935 for the 1996-1998 1500, and 400-02255B for the 1993-1995 van. Option codes listed are MG5, MG5 or M50, and MG5 and M50. The 1999-2007 unit also carries the IDs DXH, GBBH and GBKT.

Core charge and warranty

These are remanufactured exchange units, so a refundable core charge may apply. No core amount is published, so call for it when you order. A 6-month limited warranty is standard. A 7-year / 1,000,000-mile extended warranty and a core fee waiver are available on request for qualifying remanufactured units, must be arranged at the time of purchase, and are not automatic. See the transmission remanufacturing process and the warranty page, or call 216-250-6666 or email sales@varietyengines.com with your Hollander number.