When I did the SD GP's:

I did not remove any fuel lines.

I did use gear wrenches.

I did move the heater hose out of the way.

I did remove a clip and loosen the throttle linkage from the firewall, moving it out of the way.

I did cramp up.

I did lose a gear wrench.

I did buy another gear wrench.

It shook it self out a few days later, found it on the garage floor, I now have two 8mm's.

Getting the new GP in, patience.

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83 SD

84 CD