Rover V8 to MT75 Adaptor Plate – part2

Will the Borg Warner 35 Auto bellhousing mate to the MT75 manual?

Can I cut it up to make a Rover V8 to MT75 adaptor plate?

I was having one of those mental blind-spots. For some reason, because I was trying to mate the Sierra Cosworth MT75 manual gearbox to the Rover V8, my brain just wouldn’t register that there were also automatic gearboxes with removable bellhousings.

Step in the Rover P5B & P6B with the Borg Warner 35 (BW35) automatic. They are getting a little scarce now, but having seen a few Rover to Toyota 5 speed conversions, it doesn’t take a genius to guess which bellhousing they based their molds upon.

Rover V8 Bellhousing BW35 Automatic My plans to use the LT77 Bellhousing fell completely flat. The LT77 had too many lumps and bumps and hung down too low. See my LT77 Bellhousing CAD here

The BW 35 Bellhousing seems made for the job. It has a nice circular aperture at the rear that will make centralising the gearbox output shaft much easier.

It even has a cut-out that should lend itself to the Sierra’s cable clutch. Drawing this will be child’s play compared with the LT77.




Rover V8 Borg Warner 35 P5B and P6B

Chassis update….

I’ve been working all weekend on the chassis, yet when I stand back there seems very little progress. I made 11 brackets and the Sierra Diff is mounted. It’s slow work when you have to measure all of them in 3D from a single datum, although as the diff dropped straight in and all of the holes lined up, it’s been worth it! Can you tell, I’m pretty pleased with myself?

Another 15 brackets and all the rear brackets will be done. When that’s done hopefully things will look a lot different.

Rover V8 4x4 Haynes Roadster

The gearbox is welded and fitted! The MT75 4x4 gearbox has been TIG welded to a 1960's BW35 auto bell-housing from a P5B Rover Coupe. The welding was tricky but went very well in the end and from some angles it could be mistaken for a factory built box. ...

Rover V8 Sierra Clutch

As you can see in the picture above the Rover V8 Clutch (right) is much bigger than the Sierra clutch left. How did I quickly and very cheaply solve this problem? The Rover V8 has a 272mm clutch. The Sierra has a 241mm clutch. The splines are also different between ...

Rover V8 to MT75 Adaptor - part 4

This is an MT75 4x4 gearbox from a 2.0lt turbo Sierra Sapphire Cosworth. The bell-housing bolt pattern is much smaller than that of the Rover V8. Unfortunately, the bell-housing is not removable, so I am cutting it off with a hacksaw. It may seem a little Low-Tech and indeed there ...

Rover V8 to MT75 Adaptor Plate - part 3

I've been having fun converting my Rover V8 to Sierra Cosworth MT75 4x4. When you find  the correct solution to a problem, sometimes it makes previous efforts look like a waste of effort. Rover V8 to MT75 gearbox using LT77 bell-housing - Part 1 Rover V8 to MT75 gearbox using BW35 ...

Rover V8 to MT75 Adaptor Plate

The goal is to mate the Rover V8 up to a Ford MT75 gearbox. Therefore I had 2 choices: Use an Rover V8 to MT75 adaptor plate Use a complete LT77 bell-housing and remove the integral MT75 bell-housing and weld on a mounting plate. Seeing as I could not find anyone ...

Rover V8 Short Water Pump

A lot of people know the P6 water pump is much shorter than the SD1 but what is the super short water pump on the right? On the left is the standard Rover SD1 Water Pump. On the right is the Rover V8 Serpentine Water Pump. As you can see, ...

MT75 Clutch Upgrade

The goal is to mate a LT77 Rover 5 Speed Bellhousing onto a MT75 4x4 gearbox. I also wanted to upgrade the clutch. Unfortunately, I have a lot of research to do. One of the first things to establish was whether the MT75 and LT77 have similar input shafts. The quickest ...

Rover V8 Plenum Chamber

Rover V8 PlenumThis might just look like a Rover V8 Plenum Chamber, but in fact it will enable me to judge bonnet height. The Rover V8 engine is quite tall compared to others I've looked at and I am determined not to have a huge bonnet bulge that looks like a hideous ...

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