• National Transmission has a service area on the Colorado Western Slope, Roaring Fork Valley, and the I70 towns west of Vail Valley. If you live west of Vail, Avon, Beaver Creek, you should consider having your transmission repaired with National. This includes all towns on the I70 corridor such as Eagle, Gypsum, Edwards. Towns west of Glenwood Springs like New Castle, Parachute, Rifle, and Silt should bring their transmission problems to National. Aspen, Snowmass, Basalt, Carbondale and Glenwood Springs are the primary service area for National Transmission. We service Redstone, Marble as well. We are Aspen transmission services, Snowmass transmission repair, and Basalt transmission repair. For Carbondale transmission repair, National is your choice too. All of these service areas are on this side of Vail pass, and within 1 hour of National Transmission.

tranny      tranny

Services Provided

  • Transmission and Transfer case service
  • Transmission rebuild
  • Transfer case rebuild
  • Servicing and Adjusting transmissions
  • Brakes
  • Driveline, Drive Shafts, Axles, and U-joints
  • Electronic Diagnosis – Read your cars computer logs.
  • Differential service and rebuild

Parts Stocked

  • We keep Used and New parts in stock
  • We use Luk brand Clutchs.
  • We Stock Torque Converters
  • We have Cores for most GM, DODGE, and FORD

Vehicles we do NOT work on:


  • Volkswagon – See Sport Wheels 115th 6th St., Glenwood Springs, CO 81601 Call John or Charlie Phone: 970-945-2708 Email Volkswagon Questions to


  • Audi – See Sport Wheels 115th 6th St., Glenwood Springs, CO 81601 Call John or Charlie Phone: 970-945-2708 Email Audi Questions to


  • Saab – See  Swedish Automotive & Beyond 2760 Grand Avenue
    Glenwood Springs, CO 81601 Call Huba Phone:(970) 384-0249 Email Saab Questions to



Transmissions-Examples of Vehicles- “Fixes”

Allison 1000 Series

  • Chevy Duramax Diesel


  • Jeep Cherokee
  • Jeep Grand Cherokee
  • Jeep Wrangler

A518, A618, 42RE, 46RE, 47RE and 48RE

  • Dodge Ram trucks

45RFFE, 5-45-RFE

  • Jeep Cherokee
  • Jeep Grand Cherokee
  • Dodge Dakota
  • Dodge PU

A604 (AKA 40TE and 41TE)

  • Dodge Caravan, Stratus, Seabring
  • Plymouth Voyager, Acclaim, Breeze
  • Chrysler Town and Country
  • Dodge Intrepid
  • PT Cruiser


  • Jeep Liberty

A670 (AKA 31TH)

  • Dodge Caravan, Neon
  • PT Cruiser
  • Plymouth Voyager, Acclaim,

E40D/4R100 – Four-speed transmission

  • Ford Trucks, Bronco, Econoline, Excursion, Expedition
  • Lincoln Navigator

5R110- Five Speed

  • Ford Trucks, Expedition

4R44E, 4R55E and 5R55E

  • Ford Ranger, Explorer, Aerostar

5R55N, 5R55W, and 5R55S

  • 2002+ Ford Explorer


  • 91-95 Ford Explorer

AOD, AODE, 4R70W, and 4R75W

  • Ford Trucks, Crown Victoria, Econoline, Explorer, Thunderbird
  • Lincoln Towncar, Mark VIII

AXOD, AXODE, AX4S, AX4N, and 4F50N

  • Ford Taurus, Freestar
  • Lincoln Continental,

C3, C4, and C5

  • 64-69 Ford Mustang


  • Early Ford Pickups


  • Ford Escape, Contour
  • Mazda Tribute


  • Ford Focus

4EAT-F, 4EAT-G, and 4EAT-GF

  • Mazda
  • Ford Escort


  • Buick
  • Cadillac


  • Isuzu Rodeo, Trooper
  • Honda Passport

4L60E and 4L65E

  • GMC Yukon/Yukon XL
  • Chevy Suburban, Astro, Safari, Avalanche, Camaro, Caprice, Corvette, Envoy, Impala, Tahoe
  • Cadillac Escalade


  • Pontiac- Grand Am, Sunfire
  • Saturn L Series

AT60E and AT65E

  • Buick- Century, Le Sabre, Park Avenue, Rainier, Regal, Rendezvous, Riviera, Roadmaster Sedan, Skylark
  • Pontiac- Firebird, Grand Am, Grand Prix
  • Chevy- Lumina, Malibu
  • Oldsmobile- Cutlass, Silhouette


  • Oldsmobile Aurora
  • Cadillac- Concours, Deville,


  • Early Chevy Pickup


  • Chevy Pickup

4L80E and 4L85E

  • 2500 Overdrive Pickup
  • Chevy Suburban, Tahoe


  • Jeep Cherokee
  • Jeep Wrangler


  • Jeep Liberty

TAAT and AF33-5

  • Saturn

3 and 4 Shaft Hondas and F4

  • Most Hondas
  • Acuras


  • Hyundai


  • Isuzu


  • Jaguar


  • Kia

Subaru Transmission:

  • ECVT
  • R4AX-EL
  • 4-ATAXLE
  • 5-AT
  • 4EAT – Subaru Baja, Forester, Impreza, Legacy, Outback

Lexus Transmission:

  • A341E- Lexus LS400
  • A350E- Lexus GS300
  • A650E- Lexus SC400
  • A761E

Toyota Transmission:

  • A131L- Corolla
  • A241E- Celica
  • A242L- Tercel
  • A245E- Matrix
  • A246E-Celica
  • A140E-Camry
  • A540E- Camry
  • A541E- Avalon
  • A43DE- Cressida
  • A442-F- Land Cruiser
  • A340E/H/F-Sequoia, Tacoma
  • A340GTE
  • A340E- Previa, Tundra
  • A750E/F- 4Runner
  • U140E- Highlander, Camry
  • U240E- Matrix
  • U241E- Rav4
  • U150E
  • U151E/F- Camry, Sienna
  • AW55-50SB

Mazda Transmission:

  • F3A
  • N4AEL
  • G4A-EL
  • GF4A-EL
  • F4AEL
  • FA4AEL
  • LJ4AEL
  • JA5AEL
  • RE5F01A
  • FS5A-EL


  • 4 BOLT
  • 6 BOLT
  • NAG 1


  • KM175/176/177- Galant
  • F4A-41/42/51
  • R4A51


  • AW72 - Volvo740
  • AW70- Volvo 240
  • 4T65E-V – Volvo 80 Series
  • AW55-50SN- Volvo Cross Country

Shift Kit “Fixes”
We use TransGO Shift Kits in all rebuilds and we are also a member of TransGO support and the Better Business Bureau.

Transmission: What the Shift Kit will fix:


700 -Installing a TransGO shift kit will correct/prevent/reduce: late hard shifts or no 4th, 1-2 soft, bang or slide bump, cut loose 2-3 shift, highway cruise falls out of 4th, converter shudder.


AX4N - Installing a TransGO shift kit will fix: goes into neutral at a stop, no forward, planet burn up, no 4th, 2nd clutch failure, long slide 1-2 shift, rough shifts and piston seal blow off due to runaway pressure.


AXODE - Installing a TransGO shift kit will correct/prevent/reduce: planet burn up, kick-down runaway, no up-shift, 2nd clutch failure, rough shift, long shift, neutral on slow corners.


44-55E - Installing a TransGO shift kit will correct/prevent/reduce: forward clutch failure, 2/3 cut loose, hard throttle 2/3 slip, 4th and 2nd band failure, coast 3/2 clunk, won’t move.


4T60E - Installing a TransGO shift kit will correct/prevent/reduce: converter shudder/slip. Lockup on top of 2nd, falls in and out of lockup, won’t lockup, delayed 3rd or no 3rd cold.


45RFE -Installing a TransGO shift kit will: repair valve body and pump, prevent clutch burn up, rough lockup, broken springs.


4L80E - Installing a TransGO shift kit will correct/prevent/reduce: no lockup and 4th hot, hard shifts and no 4th, direct clutch slippage, prevents metal partials by separating shafts, hot idle forward clutch slip, aborts lockup and 4th, reverse delay, bind up in reverse when hot, high pressure parts breakage, direct clutch burn up, rough 1-2 shift, no up-shifts, low pressure due to solenoid filter breakup.


4R100/E4OD - Installing a TransGO shift kit will: double the holding power of the L/R clutches in manual low, prevents downhill clutch burn up, a must when using exhaust brake or loaded downgrade use, reduces 2nd clutch burn up.


5R110W - Installing a TransGO shift kit will correct/prevent/reduce: case lugs blow out, runaway reverse pressure, slips or no reverse, neutrals at stop signs.


4T60E/4T65E - Installing a TransGO shift kit will correct: no 2-3 up-shift cold, delayed 2-3 cold, 2-3 slide or runaway, seal splits or tears, seal flips sideways, 3rd clutch failure, long shifts, hard shifts, chatter with heavy acceleration from stop, no lockup or 4th.


604 - Installing a TransGO shift kit will fix: limp or burnt OD clutches.

TFOD Diesel - Installing a TransGO shift kit will: increase torque capacity, lockup and shift firmness, and reduce drain back.


4L60E - Installing a TransGO shift kit will correct/prevent/reduce: check engine blinking, brutal 1-2 shift, converter slip shudder, converter slip shudder, burn-up, erratic pump slide bounce that wears out pump and valve bores, bump-bump 1-2 or 2-3 shift rear planet or bushing burn-up, 2nd band failure.