WhalePirot
Well-known member
It was the overdrive part of the 4+3 which was a POS.
Interesting. My failure with this system was the 4, not the +3. My stock, 'little' motor cracked almost all the gears and wore through the case hardening on much of 2nd gear's teeth. The overdrive worked fine and had not worn out any parts when I sent it to Boca at 105k miles.
Once I got my car away from MacPherson Chevy, I had no big deals with the ovedrive. The system logic was new, unique in '84 and complicated. Few techs at the dealers understood them, much less were able to repair them, IF they really had a failure. There was a recall on them in about '85, which the dealer screwed up. Chevy had only trained one mechanic, at a dealer in Manhattan Beach, at that time. It was, and now I understand why, fixed locally rather than sent to DNE
I once, as prior said, fixed my overdrive's cycling on/off at steady cruise speed, by (only) changing spark plug wires. Who'd a thunk it? The car was apparently not burning all the fuel and the ECM figured, open loop, which disallowed the +3.
I've put quite a few miles, and much more power from this wild 406 than allowed, on my 4+3 and my hardened Dana 36, with no problems. I quite like the 4+3 (no foolin?) and find it just fine, if more complicated, when properly maintained.
Interesting. My failure with this system was the 4, not the +3. My stock, 'little' motor cracked almost all the gears and wore through the case hardening on much of 2nd gear's teeth. The overdrive worked fine and had not worn out any parts when I sent it to Boca at 105k miles.
Once I got my car away from MacPherson Chevy, I had no big deals with the ovedrive. The system logic was new, unique in '84 and complicated. Few techs at the dealers understood them, much less were able to repair them, IF they really had a failure. There was a recall on them in about '85, which the dealer screwed up. Chevy had only trained one mechanic, at a dealer in Manhattan Beach, at that time. It was, and now I understand why, fixed locally rather than sent to DNE
I once, as prior said, fixed my overdrive's cycling on/off at steady cruise speed, by (only) changing spark plug wires. Who'd a thunk it? The car was apparently not burning all the fuel and the ECM figured, open loop, which disallowed the +3.
I've put quite a few miles, and much more power from this wild 406 than allowed, on my 4+3 and my hardened Dana 36, with no problems. I quite like the 4+3 (no foolin?) and find it just fine, if more complicated, when properly maintained.
