Two-element filter kit with gaskets and O-rings for Allison 3000 and 4000 Series transmissions, replacing OE service kit 29558329.
Allison 3000 and 4000 Series automatics sit behind medium- and heavy-duty diesels in school and shuttle buses, box trucks, dump and refuse bodies, fire apparatus and diesel motorhomes. Unlike a pickup transmission with one filter in the pan, these units carry two replaceable filter elements behind bolted covers on the control module, and both get changed at each filter service. This kit, BCA1227KT, supplies both elements with their gaskets and O-rings and cross-references Allison kit 29558329, so a fleet shop or RV owner can do the full filter service from one box.
Allison's fluid and filter recommendations bulletin lists the two service filters as the main filter and the lube filter, with a separate internal suction filter that is only replaced at overhaul. The main filter protects the control circuit that feeds the solenoids and clutch apply pressure; the lube filter cleans fluid headed to the bearings, bushings and clutch packs. When either loads up, the pump works harder, pressure to the controls drops, and the fluid runs hotter. The filters are also your best window into the transmission: cut the old elements open and look for bronze, steel or friction material before the new ones go in.
Check the fluid at operating temperature before and after the service, and read stored codes with a heavy-duty scan tool for Allison transmissions; on units with prognostics turned on, the controller tells you when the filter is due. Plan your fluid supply ahead of time. Allison lists about 2 quarts lost when only the main filter is changed and about 8 quarts when the lube filter is changed, so a filter-only service on these units needs more fluid than many people expect. For general background on Allison fluid specifications and why TES 668 replaced TES 295, our Allison fluid and filter service guide covers it using the 1000 Series as the example; the fluid spec is the same family-wide.
This kit fits Allison 3000 Series and 4000 Series transmissions and replaces kit 29558329, plus superseded numbers 29548988, 29540494, 29545779 and 29526898 and crossovers including 57740XE, P560971 and HF28943. Allison's bulletin describes 29558329 as the 6-inch service filters for the 4-inch sump; transmissions with a 2-inch or 7-inch sump take the 4-inch filters in kit 29558328 instead. Check your sump depth and the length of the old elements before ordering. Very early units built before January 1996 with the former filter cover (29507434) also need square-cut cover O-rings, which Allison no longer includes in its kits. If you are unsure, send us the transmission model and serial number from the ID plate. Related parts are in our Allison transmission parts collection, including a second 6-inch 3000 Series filter kit.
Drain the fluid if you are doing a full service, then remove each filter cover, pull the old element, and catch the fluid that comes out with it. Install the new O-rings and gaskets clean and seat each element fully before tightening the cover bolts evenly. Refill with an Allison-approved fluid; TES 668 products such as TranSynd 668 in a 5-gallon pail are the current recommendation. Set the level on a hot check rather than trusting a cold reading. One interval caveat: Allison's bulletin allows its extended 3000/4000 change intervals only with genuine Allison high-capacity filters. With this kit, follow the shorter schedule for your duty cycle or use fluid analysis to set the interval, especially in severe service such as refuse, city transit or shuttle work.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Allison 3000 and 4000 Series transmissions that use the 6-inch service filters of kit 29558329, which Allison lists for the 4-inch sump. Units with a 2-inch or 7-inch sump use the 4-inch filters in kit 29558328.
Allison lists about 2 quarts for the main filter and about 8 quarts for the lube filter. Have enough approved fluid on hand and set the final level hot.
An Allison-approved fluid. TES 668 fluids such as TranSynd 668 are Allison's current recommendation for the 3000 and 4000 Series and are backward-compatible with TES 295.
Allison ties its extended 3000/4000 intervals to genuine Allison high-capacity filters. With this kit, follow the shorter schedule for your duty cycle or use fluid analysis.
No. Those are only needed on early transmissions built before January 1996 with the former filter cover, part 29507434, and Allison no longer includes them in its kits either. Order them separately if your cover needs them.
