'86-'91 RX-7 Rear Axle Upgrades

Looking for better mileage? lower engine RPMs? increased reliability?

How about something that can do all that AND handle up to 1000hp?

Our rear axle upgrades for the '86-'91 2nd gen RX-7 are available in 4 levels...

LEVEL 1- DIY Kit / Brackets only... these kits are available for stock suspension or torque arm suspensions. You supply the axle housing and installation labor.

LEVEL 2- Basic Torque Arm / Solid Axle Conversion Package... an 8.8 Ford axle custom built to bolt directly into your '86-'91 RX-7's existing suspension mounting points, and adds low-cost lower control arms and watts centering linkage sourced from a 1st gen RX-7. Includes installed brackets to use your existing calipers and rotors, no need to even bleed the brakes. Sway bar brackets are a no-extra-cost option. Even your existing e-brake is retained.
NOTE- the customer must supply the lower control arms, bolts/nuts, and watts linkage from a '79-'85 1st gen RX-7 to complete the package.

LEVEL 3- Upgraded Torque Arm / Solid Axle Conversion Package... Same as Level 2, but w/ fabricated upgrade components included to complete the package. These include our Extreme Duty adjustable lower links, fabricated watts linkage, and all kevlar lined premuim quality rod ends.

LEVEL 4- Extreme Torque Arm Suspension... This is an Extreme version of our level 3 package for racing duty. 35 spline forged axles are standard, as well as a 35 spline Detroit Locker. Flat spring seats are included for a wider range of spring rate choices. It includes our fabricated extreme duty 1-1/4" dia lower links, full kevlar lined rod ends for lower links, our fabricated adjustable watts linkage w/ kevlar lined rod ends, and an aluminum girdle style rear cover.


Package pricing is as follows...

'86-'91 RX-7 8.8 Level 1 DIY TA Bracket Only Kit includes...
...Torque arm assembly
...Torque arm Ford 8.8 rear anchor plate
...(5) grade 8 rear cover flange bolts
...Torque arm front yoke / driveline loop assembly
...(2) rubber chassis isolator bushing sets
...(4) Delrin T/A nose bushings
...lower link chassis bracket- right
...lower link chassis bracket- left
...(2)lower chassis bracket backing plates
...(2) lower link rear bracket sets (weld-on)
...watts linkage center pivot assembly (weld-on)
...watts linkage anchor- right
...watts linkage anchor- left
...(2) watts linkage centering sleeves (weld-on)
...(2) lower shock spacers

'86-'91 RX-7 Level 2 Ford 8.8 TA/SA Suspension Package...
...Complete 8.8 rear, assembled w/ brackets attached including...
...Upper and lower link brackets
...Fabricated helical spring pockets
...Sway bar brackets (no-cost option)
...GSL-SE caliper brackets
...Forged 31 spline axles w/ GSL-SE bolt pattern and brake offset
...New 31 spline TracLoc clutch style differential (standard)
...Gear ratio of your choice
...New bearings / seals
...(2) watts centering sleeves
...Bolt it right in. Most do not even need to bleed the brakes.
...Driveshaft exchange available to previous V-8 customers.

'79-'85 RX-7 Level 3 Torque Arm Conversion Package...
...Complete 8.8 rear, assembled w/ brackets attached
...Torque arm assembly
...(8) grade 8 rear cover flange bolts
...Torque arm front yoke / driveline loop assembly
...(2) rubber chassis isolator bushing sets
...(4) Delrin T/A nose bushings
...(2) lower link rear bracket sets (installed)
...(2) RX-7 caliper brackets (installed)
...watts linkage center pivot assembly (installed)
...(2) watts linkage centering sleeves
...choice of gear ratio and housing width
...New billet 9" style housing ends- NO MORE C-CLIPS!!!
...New 31 spline TrackLok differential (standard)
...new forged 31 spline 5 lug 9" style axles w/ studs
...new bearings / seals
...new driveshaft / u-joints

'79-'85 RX-7 Level 5 Extreme Torque Arm Conversion Package...
...Same as Level 4 plus...
...33 spline forged axles
...33 spline Pro Clutch Diff or Spool
...Extreme Duty lower links w/ premuim quality Kevlar rod ends
...Adjustable Fabricated rod end style watts linkage
...Aluminum girdle style rear cover

Available options include...
...Custom widths available (no extra charge)
...Upgrade to 5 lug axles and 2nd gen RX-7 T-II brake brackets (no extra charge)
...Upgrade to a Detroit Locker, Tru-Trac, or Spool
...driveshaft exchange program available for prior customers (ADD $270. if no exchange)
...Optional brackets and brake offset for Wilwood lightweight 4 piston calipers and lightweight 2pc rotors


CLICK HERE to view our on-line TASA install guide

CLICK HERE to view our on-line TASA install FAQ

CLICK HERE to see our 1st gen "shop mule" with TASA and full exhaust


Our TA/SA conversion system now makes it easy to get the rear gear ratio of your dreams. Our exclusive torque arm is designed to get the best compromise for both the drag and road racing worlds. Standard features of our TA conversion for the '79-'85 RX-7 are...

...Easy Bolt-In Installation...Designed to bolt right to your existing lower links and uses your existing watts linkage.
...Get the ratio you want...2.73 / 3.08 / 3.27 / 3.55 / 3.73 / 3.90 / 4.10 / 4.30 / 4.56 / 4.88 / 5.13 / 5.71 / 6.14 currently available.
...Same flange/flange width as the '84-'85 GSL-SE RX-7 (custom widths available, no extra charge)
...Same 4 on 4-1/2" GSL-SE lug pattern w/ metric studs...you can use your existing GSL-SE wheels/tires. Optional upgrades to 5/8" racing studs or 5 lug 2nd gen Turbo II wheel pattern available.
...Stock GSL-SE rotors and calipers bolt right on...retain your existing e-brake...optional upgrade to 2nd gen RX-7 T-II brake brackets available.
...Standard with new 31 spline Track Lok clutch style locking diff...optional upgrades includes spool, Detroit Locker, Torsen, E-Locker.
...Standard with custom forged 31 spline axles...Deluxe versions use NHRA legal 9" style axles and bearings to eliminate c-clips
...Rear rise instead of squat during accelleration. Lower 60' times / more forward traction from your tires.
...Torque arm design allows body roll during cornering. Roll understeer is built right in. Ladder bar & most common 4-link designs turn the rearend housing into one huge 3" dia sway bar, completely eliminating body roll, reducing your car's status to "drag-race only". Our torque arm design allows body roll, giving the driver important feedback necessary to perform consistant high-speed transitions.
...Use your existing rear springs / shocks. They just bolt directly to our brackets.
...Driveline loop feature included as standard equipment.

Our 8.8 TA Packages come standard with Billet 9" style housing ends and Forged 31 spline 9" style axles- NHRA LEGAL- NO MORE C-CLIPS or LEAKY C-CLIP ELIMINATORS!!!

Here's some TA dragstrip feedback reported by a 2nd gen / SBC customer in Louisiana....
footbrake w/ Turbo 350 (all motor)...10.65 @ 130mph / 1.45 60'
transbrake w/ Powerglide (all motor)...9.75 @??? / 1.30 60'

This car sustained extensive damage from a hard landing after carrying the front wheels out past 60 feet. The damage was to the engine's oil pan, stock subframe, and transmission oil pan. The TASA Torque Arm also sustained enough damage from the incident to require replacement. Wheelie bars are now being added. Not too bad for a streetable suspension that can still go around corners.
We also use the Torque-Arm suspension conversion on our '85 RX-7 "shop mule".

Major components of the TASA system function as follows...
...Torque Arm Assembly- This is the key component that controls the huge re-action forces of the rear axle, efficiently re-directing that force in a manner to increase rear tire traction during acceleration. We have settled on an effective length of 33" (45" available on request), and prefer to use rubber bushings at the front to help reduce peak impact loads on drivetrain components. Using the 5 lower attaching points for the rear cover, a rear anchor plate takes force from the rear part of the housing, transferring that force to the lower tubes of the torque arm. To receive force from the nose of the rearend housing, we use a 3/16" plate that closely fits around the housing in the area of the front pinion bearing. A bolt-on lower section allows us to fit the torque arm's nose plate over the 8.8's pinion flange, allowing for easy assembly. By attaching the torque arm directly to the 8.8's center housing, we eliminate the need to weld the axle tubes to the rear's center section, a necessity if one were using a conventional ladder bar style setup. The nose of the torque arm sits in the center of the car, directly under the driveshaft, and is connected to the front yoke..
...Front Yoke / Driveline Loop- This is the actual component that connects the torque arm's lifting force to the RX-7's chassis. The yoke's design allows the driveshaft to pass thru it's center, feeding the torque arm's lifting force into the RX-7's chassis at a point nearer the car's center-of-gravity, above the driveshaft, into the top of the transmission tunnel. As the yoke completely surrounds the driveshaft, it also functions as a built-in driveline loop. The yoke is essentially a floating loop around the driveshaft, hanging from the top of the transmission tunnel, with it's lower part connected to the nose of the torque arm.

For those looking to keep cost to a minimum, our TA conversion is also available in kit form. The kit allows you to locally source your own rear housing/differential/axles/lower arms/watts linkage (welding required to attach our brackets to your axle tubes).


Here's a couple of pictures of a 1st gen RX-7 TASA conversion...while our system uses the same lower control arms, we completely eliminate the upper arms of the RX-7's stock 4 link, allowing us to narrow the rear significantly, making it possible to use easier to find wheels with less backspace.


For the 1st gen RX-7, we offer a smaller diameter coil spring option with threaded sleeves for adjustable ride height. Many spring rates are available.


The larger diameter of the 8.8 center section requires an adjustment to the length of the watts link's "links" to properly center the rear under the car. We supply sleeves that have the inside diameter perfectly sized, making it easy to simply salvage the original link ends for an economical solution that requires minor welding.



...Click Here for Ordering Information...
...If you have any questions for us, feel free to e-mail or call us at 360-391-1208 or 360-853-8219

...Our mailing address is:
Granny's Speed Shop
POB 814
Concrete, WA 98237