Just wanted to make everyone aware of the new recommended service on the allison that came out yesterday. The fluid change interval has been changed.

SMU - Revised Maintenance and Lubrication for Automatic Transmission Service Interval/correct Filter to Replace #05-00-90-005 - (May 26, 2005)

Revised Maintenance and Lubrication for Automatic Transmission Service Interval/Correct Filter to Replace

2001-2006 Chevrolet Silverado

2001-2006 GMC Sierra

with Allison® Automatic Transmission

This bulletin is being issued to revise the first automatic transmission service interval and specify what filter to replace in the Maintenance and Lubrication sub-section of the Service Manual. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI for 2001-2004. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. The 2005 and 2006 Owner's Manuals have also been corrected.

The first automatic transmission service interval is at the first maintenance service performed on the vehicle. At that time, change the external spin-on filter only.

At every 83,000 km (50,000 miles) (normal service) or every 41,500 km (25,000 miles) (severe service), change the external spin-on filter and fluid. The sump filter is to be changed only during an overhaul.

Gotta change my fluid time for a tran's upgrade. dave

Must not be selling enough tranny's ! The filter media on the internal filter looks like the same stuff GM's been use'n since the 60's, and those needed to be changed regularly. Ford uses a screen to keep the BIG CHUNKS out, I can see not change'n them. Come on, give me a break!

Must not be selling enough tranny's ! The filter media on the internal filter looks like the same stuff GM's been use'n since the 60's, and those needed to be changed regularly. Ford uses a screen to keep the BIG CHUNKS out, I can see not change'n them. Come on, give me a break!

I always figured the internal filter was just a backup to the spin-on filter, hence the reason it didn't need changed regularly. I don't think GM was using spin-on tranny filters in the 60's.