Metric Mechanic Race Motors!  
Return Home
 - 
Catalog
 - 
 - 
 - 
About Us
 - 
 - 
 - 
 - 
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   
   


The Ultimate 5 Speed Transmission Conversion



 

One of the most popular 'updates' for all BMW models with 4 speeds, as well as any model with an a automatic, is the conversion to an "Ultimate" 5 Speed, or a Metric Mechanic Sport/OD 5 Speed transmission. Adding a 5 Speed has the effect of updating and modernizing an earlier BMW. It can also improve performance and add shifting excitement to drivers with automatics.

What are the Advantages of a 5 Speed Conversion?
The factory 18% overdrive 5 Speed, offers the following advantages when the 5th gear is used!

  1. 12% increase in fuel mileage.
  2. 30-40% increased engine life.
  3. Reduces annoying engine and fan noises.


By Substituting one of our Metric Mechanic Sport/OD 5Speeds, these gains become even greater.

Metric Mechanic's Hassle Free, Time Saving 5 Speed Conversion Kits!
Our conversion Kits are so streamlined and complete that installing them is simply a "bolt-In" operation. This is because many of the parts used in our conversions are manufactured by us and are designed to eliminate the need for any further fabrications or modifications.

Since 5 Speed transmissions were not an option until 1980, most of the parts in each model's respective conversion kit were fabricated or otherwise modified by us to fit the application. This means that not only are the kits comprehensive (including related hardware), but we have taken special care to "work the bugs out" to ensure a hassle-free, "bolt-In" operation.We have 5 Speed conversion kits available for all BMW models with 4 Speed transmissions. Also, many customers, especially the 2002 and the early coupe owners, buy our conversion kits minus the "Ultimate Transmission" or even just parts of the kit.

5 Speed Conversion for the 2002, Conventional Method versus the Metric Mechanic Way.


 
Conventional
5 Speed Conversion Kit & Installation
Metric Mechanic
5 Speed Conversion Kit & Installation
Rear Transmission Mounting Bracket Fabrication Required
A cross-member must be fabricated to provide rear support for the transmission. Generally, this is done by relocating the stock cross-member about 3.5" to the rear. To do this you'll need to attach a set of mounting ears to the tunnel. This is done by pulling up the carpet over the tunnel area to drill or weld in these mounting ears. Using this mounting system requires beating out the right side of the tunnel and the area around the clutch slave cylinder (with a 3 to 5 lb. sledge hammer). Often, the transmission may need to be removed and re-installed several times to establish clearance between the transmission and the tunnel. Of all the procedures needed, none is a greater headache than this.
Bolt In
We have devised and innovative type of rear mounting bracket that uses the stock 2002 cross-member mounting points and bolts to the back of the Getrag 245 transmission. This mounting bracket uses a cylindrical type mount to reduce the side-to-side movement of the transmission which in turn eliminates the need to beat out the tunnel. Sometimes a small amount of clearance may be needed for the clutch slave cylinder. This is easily achieved by pushing the tunnel away from the slave cylinder with a small pry bar.
The Shift Bracket Modification Required
The shift bracket needs to be shortened so that it's centered in the shift hole correctly and then re-welded.
Bolt In
Our Shift Bracket is cut and re-welded in a jig fixture for proper fit.
Support Arm for Shift Brackets Fabrication or Modification Required
The stock 2002 Support Arm is rather weak and prone to bend. Some people choose to modify this arm or fabricate something in it's place.
Bolt In
Our support arm is much stronger than stock and uses a replaceable rubber mount.
Lower Shifter Modification Required
The extension rod needs to be shortened, fitted and re-welded.
Bolt In
Our Short Shift Kit extension rod has a special 10mm offset which centers the shifter in the shift bracket and the shift hole in the tunnel.
The Hydraulic Line from the Clutch Slave to the Clutch Master Cylinder Improvisation Required
The stock hydraulic line that runs from the clutch master to the clutch slave cylinder is too short and improperly bent.
Bolt In
Our Conversion Kit comes with a special 3 piece hydraulic line to solve this problem.
Exhaust Down-pipe Bracket Improvisation Required Bolt In
Our kit contains a down-pipe hanger bracket.
HiTorque Driveshaft Modification Required
The 8 bolt Guibo, as used on the 2002, is very prone to cracking and coming apart. The 6 Bolt Guibo is much more reliable. This adaptation can be done by cutting off a 3 bolt, 320i driveshaft flange and welding it to a shortened 2002 driveshaft.
Bolt In
Our HiTorque driveshaft comes with a special 3-bolt Metric Mechanic flange and new center support bearing.
HiTorque Driveshaft flange Adaption & Welding Required
A 3 bolt 320i flange will suffice for this application with one drawback; the collar is very short & difficult to align properly on the driveshaft.
Welding Required
Metric Mechanic's special 3-bolt flange has an extra long collar for easy installation & welding onto a 3" shortened 2002 driveshaft.
Driveshaft Modification Required
The stock driveshaft needs to be shortened 3.5625". Many local driveshaft companies don't want to fool with BMW's 2 piece driveshaft's so getting this done can be a problem. Others try to use the close ratio 5 Speed 2002 driveshaft, but it's about 1/2" too long and won't work.
Always Available
We supply you with a pre-cut drive shaft equipped with a new center support bering and guibo (flex disk).
Four Bolt Drive Flange Limited Availability
Most 245 transmissions didn't come with a 4 bolt drive flange. These flanges can be very difficult to find due to their limited availability.
Always Available
If you purchase the "Ultimate 5 Speed Conversion" from us this flange comes with the transmission. It can also be bought by itself.
Speedo Cable Limited Availability
Always Available
Time to Complete the 5 Speed Conversion Twenty to Sixty Hours
Four to Twelve Hours.
Installation Quality Adequate, looks homemade!
Excellent, looks like a factory installation.
 


09-02-2010 03:21:18 PM
Copyright © 1976 - 2010, Metric Mechanic™, All Rights Reserved.