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Hi
My 1953 GMC is 270 with hydromatic. Starter won't turn over very fast, it is new 6 volt and new battery. Hx ordered new starter and it arrived but nose was wrong for my truck, autoparts swapped my original starter nose onto new starter.

With starter out of engine I connect 6 volt, it engages but as I keep power to starter it increases speed like giving it slow gas? Nothing was done with nose at change is there anything that would keep it from working properly?

The most important rule in working on vehicles is NEVER ASSUME ANYTHING. Just because something is new doesnt mean it cant be bad. I would have the batt load tested and make sure it is fully charged. It could be the bushing is worn in your drive end and letting the armerature drag on the pole shoes. Is your cables heavy enough that you are using? A starter should be at full speed and power the second you hook it up.

Thank you, will have a load test done and the nose bushing replaced because if the the starter I took out was original 53 then bushing would have had a lot of use. will post results when Done.

When rebuilding the old 6V starters it is important to undercut the mica between the armature segments, a standard procedure back then. Modern rebuild shops may not do that now. Should be done. Do it yourself. Even using an old hacksaw blade, or other sharp tool, should be cut 1/32" below copper segments.
I had another 6V starter that had a poor solder joint where the 2 field leads connect to the copper bolt that goes thru the case. It was not getting full power, and would run slow.

Hi again
Thanks for suggestions on my starter, I took it in and the auto parts store ordered bushing, however they showed me bench test and with 6 volt it was full power and battery checked out good. They said to clean the ground straps, I have two, one to frame to battery and one to engine to frame, I will take these braided straps off and clean all contact places and reattach. Hope this will work. I did not bring my starter back and told them to put in bushing when it arrives then I will try starting.

Thank you, I appreciate any help. Shop showed me bench test and starter worked strong but I have them go ahead and put in new bushing before I bring starter home. they suggested I clean ground straps and then see how it works. Next week I will get starter back and try again.

Hi Guys, Thanks for advice it helped to put me on track with the starting. I found out for engines with the hydramatic the starter is different than a stick shift (requires more power for automatic) Had I known this I would have converted to 12 volt but as it is I bought new battery ground cables and cleaned of frame and motor gound straps and ran a ground strap to starter from frame. I then wired up ignition switch right to starter and coil this allowed me to by-pass old wiring and the engine turned over some better. found bad coil and replaced so after 3 1/2 months of starter issues I did get the unit to run and it sounded awsome. Thanks guys.

Hi I need more advise, I wired ignition switch direct to starter after I got all new battery cables and direct ground to starter, the old rig still turns over slow but was able to get started so am encouraged. wired up to original wiring and it is turning over too slow to start, replaced one primary wire no change. My old maintenance manual says starters for hydromatic is different than for stick so this may the real issue, any ideas? Starter and battery were bench tested strong. thanks in advance and God bless.