Full Floater Posted August 17, 2022 Share Posted August 17, 2022 Is anyone running a delco-remy 39mt on Mack 675's? I run them on other engines and they have been great and they are smaller and lighter, making them easier to install remove. I have a 1975 235 that needs a starter, I think im going to try the 39mt instead of the 42mt. At the very least it will be an easier install. Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/ Share on other sites More sharing options...
Dirtymilkman Posted August 17, 2022 Share Posted August 17, 2022 I guess I use them on e6's. Way easier to install. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506689 Share on other sites More sharing options...
Draggin Wagon Posted August 18, 2022 Share Posted August 18, 2022 Full Floater, please holler back if this works out ok. If possible post a picture . That would be a handy modification on the old Draggin Wagon when the time comes. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506701 Share on other sites More sharing options...
Joey Mack Posted August 18, 2022 Share Posted August 18, 2022 The Delco 308 39MT 11 tooth starter, is a good alternative. Lighter, and less amp draw.. Typically not rebuildable in some ways, because there is no nose bearing.. I do know that the little relay can fail, but they run about $30.00, and is easy to replace, just keep tabs on the polarity.. I like them.. I try to get my customers to use them instead of the 42 MT.. Of course, the 42 MT and the 50 MT are great starter's.. Just my opinion.. jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506707 Share on other sites More sharing options...
Full Floater Posted August 18, 2022 Author Share Posted August 18, 2022 Sounds good. I will order one tomorrow and will report back with fitment results. This particular truck is a positive ground truck. Haven't decided if im going to convert to Neg ground now or later. I do believe starters don't care about polarity, just the relay does. I have used the 39mt's on everything from 466 IH to 855 Cummins and they seemed to hold up well. Even with the stubborn 855's on a cold morning 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506733 Share on other sites More sharing options...
fjh Posted August 18, 2022 Share Posted August 18, 2022 (edited) 6 hours ago, Full Floater said: Sounds good. I will order one tomorrow and will report back with fitment results. This particular truck is a positive ground truck. Haven't decided if im going to convert to Neg ground now or later. I do believe starters don't care about polarity, just the relay does. I have used the 39mt's on everything from 466 IH to 855 Cummins and they seemed to hold up well. Even with the stubborn 855's on a cold morning Don't let them talk you into the road choice copy cat stuff buy the the genuine Delco! Edited August 18, 2022 by fjh 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506750 Share on other sites More sharing options...
Dirtymilkman Posted August 19, 2022 Share Posted August 19, 2022 14 hours ago, fjh said: Don't let them talk you into the road choice copy cat stuff buy the the genuine Delco! Any of that Road Choice or Road Force shit is garbage. I did a clutch once with that because that was one that was available the quickest. It was bad. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-506825 Share on other sites More sharing options...
Freightrain Posted August 21, 2022 Share Posted August 21, 2022 My starter is very lightweight aluminum and easy to handle.... Oh, that's right, I have an air starter....LOL. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-507047 Share on other sites More sharing options...
Full Floater Posted August 21, 2022 Author Share Posted August 21, 2022 Got the 39MT in. Will get a pic later today. Much easier to handle then the 40 or 42MT. Probably still have to remove one of the oil filters for install (which I already had out) but so what. It spins the engine over plenty fast. The truck has also lost it's prime, so had to do some long cranking and it did just fine. This truck is positive ground so I did bypass the neg ground solenoid that was on the 39mt and wired the trigger wire to an existing solenoid already on the truck for the old starter. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-507071 Share on other sites More sharing options...
Full Floater Posted September 26, 2022 Author Share Posted September 26, 2022 Finally getting around to uploading a pic. This is the 39MT in a Western (narrow frame) 1975. Don't mind the mess, the truck's being resurrected from the dead 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-510386 Share on other sites More sharing options...
terry Posted September 26, 2022 Share Posted September 26, 2022 You ain't put a starter in till you try a DM or U model with one of them old heavy delco starters by yourself! Don't think i could do it anymore. terry Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-510390 Share on other sites More sharing options...
Joey Mack Posted September 26, 2022 Share Posted September 26, 2022 You know it.... The 42 MT is heavy, but at least it has a nose cone that can hold it in place while you rest your arms.... Jojo 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-510391 Share on other sites More sharing options...
Full Floater Posted September 27, 2022 Author Share Posted September 27, 2022 They can sure bring a man to almost tears. I have a White Western star that is almost as bad. Also swapped that to a 39MT on the Big Cam Cum-a-part which made install easier 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70300-delco-39mt-starter-on-675-engines/#findComment-510420 Share on other sites More sharing options...
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