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Grannas Racing

GR1200 Built/Upgraded T56 Magnum 6-speed transmission

$ 9,450.00

Grannas Racing

GR1200 Built/Upgraded T56 Magnum 6-speed transmission

$ 9,450.00

$ 9,450.00

Got a big power REAL H-Pattern street car and need a built T56 Magnum? Look no further, the GR1200 is what you need. This is the strongest, smothest operating, synchonized street car transmission. No need for an external electric pump that is loud, annoying, and will die eventually.

The GR1200 (previously GR1000) now features a mechanical/internal oil pump, reduced gear noise, REM polished gearset, polymer fork pads and carbon/hybrid blocker rings for smooth shifting. Available for ALL Tremec Magnums, including the Magnum, Magnum-F, and Magnum XL.

We keep the TUET16362 Magnum-F GR1200 IN STOCK, all other part numbers and models are special order and custom built, with lead times around 6 weeks.

STANDARD UPGRADES on all GR1200 transmissions:

  • Internal/mechanical fluid pump - no need for loud external electric pumps that can burn up
  • Reduced Gear Noise (At least 6db lower gear noise)
  • REM ISF Finished Gears, Shafts and Rails (increases gear life, less heat, less power loss, less vibration)
  • Updated 2nd Gear Design
  • Updated 1-2 Synchronizer Hub Design
  • New Full Carbon Blocker Ring Set 1st and 2nd Position
  • New Carbon / Hybrid Blocker Ring Set 3rd, 4th, 5th, 6th & Reverse Position
  • Aerospace Polymer Fork Pads
  • Grannas "Orange Man Bad" Cerakote (dissipates heat vs powdercoating)
  • Built and Blueprinted by a Master Tremec Tech
  • Dyno Checked for proper functionality before shipping

We can also do other custom options, like change gear ratios (5-6 only) or put GM inputs into Ford Magnum XL's. The GM swapped XL is common on Nissan applications or other applications where a lengthy transmission is required but also needs a small pilot GM input.

Part numbers / available ratios


TUET11009 (GM) - Close+Short 2.66, 1.78, 1.30, 1:1, .80, .63
TUET11012 (GM) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET16885 (GM) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
CUSTOM (GM) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50
TUET11010 (FORD) - Close+Short 2.66, 1.78, 1.30, 1:1, .80, .63
TUET11011 (FORD) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET16884 (FORD) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
CUSTOM (FORD) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50


TUET16362 (GM) - Close+Short 2.66, 1.78, 1.30, 1:1, .80, .63
TUET17638 (GM) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET16363 (GM) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
CUSTOM (GM) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50

Magnum XL

TUET16886 (FORD) - Close+Short 2.66, 1.78, 1.30, 1:1, .80, .63
CUSTOM (FORD) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET11940 (FORD) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
TUET11430 (FORD) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50
TUET16886 (GM) - Close+Short 2.66, 1.78, 1.30, 1:1, .80, .63
CUSTOM (GM) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET11940 (GM) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
TUET11430 (GM) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50


TUKT16901 (FORD) - Close+Mixed 2.66, 1.78, 1.30, 1:1, .80, .63
CUSTOM (FORD) - Wide+Tall 2.97, 2.10, 1.46, 1:1, .74, .50
TUET12021 (FORD) - Wide+Short 2.97, 2.10, 1.46, 1:1, .80, .63
TUET12019 (FORD) - Close+Tall 2.66, 1.78, 1.30, 1:1, .74, .50



Grannas Racing warrants that each transmission sold by Grannas Racing will be free from defects in material and workmanship under normal use for a period of 90 days after delivery of the transmission. Grannas Racing sole obligation under this warranty shall be to repair or replace the defective transmission at no charge to the customer. Under no circumstance will Grannas Racing be liable for any oil, towing, labor, or rental vehicle charges. As a condition of this warranty the customer must return any allegedly defective product, freight prepaid to Grannas Racing, accompanied by a packing slip indicating the shipper and original invoice number. This warranty does not apply to unsatisfactory product performance which is attributed in whole or in part, to any factor, condition, or circumstance other than defects in material or workmanship. Without limiting the foregoing, this warranty shall be null and void if repair or replacement is required because of improper installation, accident, physical or electrical stress, neglect, misuse, or any other cause other than the ordinary and intended use for which the product was designed, or if the product has been dismantled, altered, or repaired by the customer or by any third party. This warranty expressly does not cover loss or injury from the use of the product. By accepting and/or installing product, you are agreeing to the terms of the warranty. Parts damaged due to any reason other than defects in material or workmanship will be the sole responsibility of the customer. We are selling you a product that depends on other components for proper operation. The life and performance of transmissions are dictated by quality of installation, associated components, and capability of the driver/operator. It is the potential installer and/or assembler’s responsibility to determine whether he or she has the necessary skills, knowledge, and tools to properly and safely install the Grannas Racing built transmission described herein. Improper installation may cause the vehicle to function improperly or not to function. Improper assembly and/or installation may additionally cause a risk to personal safety or property. If the assembler and/or installer is confused or has questions or concerns about a particular assembly or installation, he or she should contact Grannas Racing before proceeding further. The information contained in these instructions does not constitute a warranty or guarantee of any kind. An assembler’s and/or installer’s failure to correctly follow these guidelines constitutes a waiver of the assembler and/or installer’s rights against Grannas Racing regarding any subsequent damages to property or personal injury caused by the assembler’s and/or installer’s improper assembly and/or installation. Grannas Racing is not responsible for any vehicle damage resulting from improper installation or transmission failure. It is the customer and/or installers responsibility to install proper safety equipment into the vehicle upon installation of transmission or components. If you feel the need to act upon this warranty, you must contact Grannas Racing at the first sign of an issue via email. If contact is not made when the issue arises, and normal operation of the vehicle continues the warranty will be void.