ALLISON TRANSMISSION TO '71-'84 gm figure 8 PATTERN gm NP 205 adapter

note- must use the gm np205 figure 8 pattern to circular pattern adapter ( sold seperately )

$589.00

Plus Applicable Sales Tax & Shipping

np205 vehicle speed sensor pigtail harness

$12.22

Plus Applicable State Sales Tax & Shipping

PARTS REQUIRED


  • '71-'84 GM Figure 8 Pattern NP205 Transfer Case
  • '01-'16 GM 2500HD/3500HD ​Allison 1000 Series 5 or 6 Speed Transmission
  • Vehicle Speed Sensor Conversion

cnc machining service: np205 rear bearing retainer housing modification

note- rear bearing retainer housing must be a bare casting free of grease & Oil.   an additional charge of $50.00 will be applied if the bearing retainer housing arrives at our facility completely assembled.  

$113.60

Includes USPS Medium Flat Rate Box Return Shipping@ $13.60

32 spline front output shaft

$195.00

Plus Applicable State Sales Tax & Shipping( USPS Medium Flat Rate Box for $13.60 )

np205 vehicle speed sensor

$164.20

Plus Applicable State Sales Tax & Shipping

features


  • Allows the '71-'84 GM NP205 Transfer Case to be mated to the Allison Transmission
  • Requires a 90mm Input Bearing Diameter
  • Single Clocking Orientation for Maximum Ground Clearance

features


  • .625" Thick HRPO A36 Steel Plate
  • Adapts the '71-'84 Figure 8 Pattern to a Circular Pattern

29 spline np205 input shaft

$212.50

Plus Applicable State Sales Tax & Shipping ( USPS Medium Flat Rate Box for $13.60 )

29 spline coupling shaft

$99.00

Plus Applicable State Sales Tax & Shipping ( USPS Medium Flat Rate Box for $13.60 )

'71-'84 gm figure 8 PATTERN to circular pattern adapter

note- must use the allison transmission to circular pattern adapter ( sold seperately )

$175.00

Plus Applicable Sales Tax & Shipping

While we were developing the '85-'91 GM Circular Pattern NP205 to Allison Transmission Adapter we knew these transfer cases are very expensive and hard to find.  Knowing that we decided to develop a combination adapter that allows the '71-'84 GM Figure 8 Pattern NP205 Transfer Case to be mated to the 5 or 6 speed Allison Transmission.  Now you can rest at ease knowing it can be done quickly and easily with the GM Figure 8 Pattern NP205 Transfer Case.  These transfer cases are a dime a dozen and is the perfect solution for your GM Square Body Duramax Diesel Engine Conversion and will allow the use of the passenger side drop Dana 60 front axle.  This will maintain the outside appearance of the nostalgic GM Square Body in every way possible.  

PARTS included


  • Laser Cut Profile & CNC Machined Steel Adapter
  • ​Mounting Hardware
  • ​Input Bearing Oil Seal

np205 40 pulse tone wheel

$51.95

Plus Applicable State Sales Tax & Shipping

np205 mechanical drive speedometer plug

$20.79

Plus Applicable State Sales Tax & Shipping

large bearing np205 rebuild kit

$194.18

Plus Applicable State Sales Tax & Shipping ( USPS Medium Flat Rate Box for $13.60 )

ALLISON TRANSMISSION TO '71-'84 GM figure 8 PATTERN NP205 conversion



NP 205 features


  • HD Cast Iron Construction
  • Helical Gear Driven
  • 1.96:1 Low Range Ratio & 1:1 High Range Ratio
  • Synronized High Range Gear
  • Part Time 4WD
  • ​Manual Shift
  • Fixed & Slip Yoke Rear Output Shafts Available

parts included


  • Fully CNC Machined 6061-T6 Billet Aluminum Adapter
  • ​High Strenght Mounting Studs & Flanged Headed Lock Nuts
  • O-Ring Seal