Hello to whomever may be reading this, at one point a mod was created by the name of Allison transmission megapack, it used to have several GM automatic transmissions built into it, but a decision was made to remove those transmissions from the mod and rebuild it from scratch.
Unlike before, there wasn't that many vehicles being supported for the GM automatic transmissions, this isn't the case no more, there are also plenty of differential ratios to choose from, ranging from 2.64:1 to 3.87:1 however some vehicles won't have all of the differential ratios due to either certain differential ratios already existing or the differential ratio was way too close to another differential ratio making a very little difference in change.
So that users are able to tell if they are finding the right differential ratio from this mod it will have the letters on the name of the part "GM"
Here is a list of vehicles supported.
Burnside Special (GM TH350, TH400, 4L60E, 4L80E)
Bruckell LeGran (GM THM125, 3T40, THM440-T4, 4T60E)
Bruckell Moonhawk (GM TH350, TH400, 4L60E, 4L85E, 6L90E)
Bruckell Bastion (GM 4L60E, 4L80E, 6L90E, 8L45, 8L90, 10L90-E)
Gavril Barstow (GM TH350, TH400, 4L60E)
Gavril Bluebuck (TH400, TH200-4R, 4L60E)
Gavril D-Series + Roamer (GM TH350, TH400, 4L60E, 4L80E, 5L40-E, 6L90E, 10L80E)
Gavril Grand Marshal (GM TH350, TH400, 4L60E, 4L80E, 6L90E, 8L45E, 8L90E, 10L90-E)
Gavril H-Series (GM TH350, TH400, 4L60E, 4L80E, 5L40-E, 6L90E, 10L80E)
Ibishu 200BX (GM TH350, TH400, 4L60E, 4L80E, 4L85E, 6L90E, 8L45, 8L90)
Ibishu Covet (GM TH200-4R, TH350, TH400, 4L60E, 4L80E)
Ibishu Hopper (GM TH350, TH400, 4L60E, 4L80E, 6L90E)
Ibishu Miramar (GM TH350, TH400, 4L60E, 4L80E)
Ibishu Pessima '89 (GM TH350, TH400, 4L60E, 4L80E, 4L85E, 6L90E, 8L45, 8L90)
Ibishu Pessima '99 (GM TH350, TH400, 4L60E, 4L80E, 4L85E, 6L90E, 8L45, 8L90)
Soliad Wendover (GM THM125, 3T40, 4T40E, 4T60E)
Soliad Lansdale (GM THM125, 3T40, TH200-4R, 4L60E, 4L80E)
SP Dunekicker (GM TH350, TH400)
SP Rockbasher (GM TH350, TH400)
'71-'74 Dodge Charger (GM TH350, TH400, TH200-4R, TH700-R4, 4L80E, 4L85E)
1991 Chevrolet Caprice (GM TH400, 4L80E)
Dodge Charger (GM TH350, TH400, TH200-4R, TH700-R4, 4L80E, 4L85E)
Dodge Coronet (GM TH350, TH400, TH700-R4)
Ford Mustang Shelby 500KR (GM TH350, TH400)
Ford Mustang Fastback (GM TH350, TH400, TH700-R4)
Ford Crown Victoria (GM TH350, TH400, 4L60E, 4L80E)
Ford Bronco (GM TH350, TH400, 4L60E, 4L80E, 5L40-E, 6L90E)
Nissan Terrano (GM TH350, TH400, 4L60E, 4L80E, 5L40-E, 6L90E)
Oldsmobile Delta 88 1973 (GM TH350, TH700-4R, 4L80E)
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Programs/Websites used:
Notepad++
7zip
Pixlr online photo editor
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Compatible mods:
[CEEP] Classic Engine Expansion Pack by JΛVI
6.0L Diesel V8 Engine for 1992-1996 Ford Bronco by 0xferd
Upcoming mods to support:
v1.6 - added 4 more "modded" vehicles.
Dodge Coronet
Oldsmobile Delta 88 1973
Dodge Charger 66/67/68/69/70 with Daytona
'71-'74 Dodge Charger
Upcoming fixes with the mod:
v1.6 - Renamed transmissions to have "0xferd" listed on the transmissions.
This is to keep any other transmissions from different mods from duplicating the same name of the transmission name more than once.
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Just a heads up, if anyone out there is interested in adapting their own mod to work with this mod then here is the following torque converter slot names.
Change ReplaceMe to the name of the vehicle folder for a specific vehicle that you wish to use it for.
For example, pickup, hopper, van
ReplaceMe_non_locking_converter
ReplaceMe_non_locking_converter_diesel
ReplaceMe_non_locking_converter_diesel_LHD (only for Nissan Terrano mod)
ReplaceMe_locking_converter_3t
ReplaceMe_locking_converter_t4
ReplaceMe_locking_converter_4r
ReplaceMe_locking_converter_r4
ReplaceMe_locking_converter_4l
ReplaceMe_locking_converter_4l_diesel
ReplaceMe_locking_converter_4l_diesel_LHD (only for Nissan Terrano mod)
ReplaceMe_locking_converter_4l85e
ReplaceMe_locking_converter_4t
ReplaceMe_locking_converter_5l
ReplaceMe_converter_diesel_5l
ReplaceMe_locking_converter_5l_diesel
ReplaceMe_locking_converter_5l_diesel_LHD (only for Nissan Terrano mod)
ReplaceMe_locking_converter_6l
ReplaceMe_converter_diesel_6l
ReplaceMe_locking_converter_6l_diesel
ReplaceMe_locking_converter_6l_diesel_LHD (only for Nissan Terrano mod)
ReplaceMe_locking_converter_8l
ReplaceMe_converter_diesel_10l
ReplaceMe_locking_converter_10l
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Please know that the icon for this mod may be very similar to the real GM logo, instead of using a copyrighted logo for the mod icon, a custom logo was created by scratch with using Pixlr online photo editor.
All credits to the following.
BeamNG devs, MSX98FMDnB, BryceSTP, mehio, MaxieTheFoxxie, baldmtn, JNR231, matissator, xerial, LJ74
Beta GM automatic transmission megapack 1.6
Ever wanted some GM automatic transmissions? Well now you can!
Recent Updates
- Updated mod to v1.6, more information below. Mar 10, 2026
- Fixed an issue with the GM 5L40-E transmission Dec 16, 2025
- Transmision rework, more details listed in description. Sep 16, 2025