Allison 1000 fluid capacity varies by service type. Pan drop is different from full flush. Here are the right amounts.
Fluid type
- Allison Transynd TES-295 / TES-668
- Don't substitute with other ATF
- Synthetic only for long life
- Read our transmission fluid types
Capacity by service
Pan drop + new filter:
- 6-7 quarts
- Doesn't drain converter or cooler
Pan drop + internal filter only:
- 5-6 quarts
- Lighter service
Full flush (machine):
- 14-17 quarts total
- Drains everything including converter
- Read our how to flush transmission fluid
After rebuild:
- 14-17 quarts (full dry fill)
- Includes external filter
- Read our best Allison 1000 rebuild kit
Service intervals
- Tow use: pan + filter every 30,000 miles
- Normal use: pan + filter every 60,000 miles
- Full flush every 100,000 miles
- Read our diesel tow rig setup
Cost
- Transynd: $35-$50 per gallon (~$8-$12 quart)
- Pan service: $80-$150 in fluid
- Full flush: $130-$200 in fluid
- Filter: $30-$70
- Gasket: $15-$30
Common mistakes
- Overfill — causes foaming and aeration
- Wrong fluid — voids warranty, causes shudder
- Skipping external filter (some apps have one)
- Read our transmission rebuild mistakes
How to check level
- Engine running
- Trans warm (180°F)
- Park or Neutral
- Read dipstick or use scan tool fluid level display
- Read our how to check transmission fluid
Need Allison 1000 service parts? Shop our Allison catalog. Filters, gaskets, complete rebuild kits. Free shipping over $70.
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