Those who have done MileMarker conversion... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 04-14-2018, 09:53 AM

Are you happy with the results, cost and reliability? Thinking of doing the 502 kit in my 87 half ton. No garage up here in Maine but I have a driveway and I’m not afraid to use it

https://milemarker.com/product/502-conversion-kit/

B. W. · 04-14-2018, 11:36 AM

I worked for a company that had a fleet of GM trucks in the 70's & 80's. We converted every 203 we had. I can't remember ever having an issue with them. I believe they picked up fuel mileage but can't remember that either! (but what would that be? From 8 mpg to 10?) The trucks were loaded heavy & run hard. I don't remember the name of the conversion kits but they were similar in design.

With that said, my DD is a 79 GMC K25. It still as the full time slugs in the axle but someone converted the T-case. (I'm guessing the PO took the lockout hubs with him) It has slop in the case when engaging 4wd & has gotten worse over the years. It's so bad now that I need to repair or replace it. This truck has been worked hard plowing & hauling cord wood.

v30crewcab · 04-15-2018, 10:03 AM

87 wont have a 203 tcase. it should be a 208. all you need is manual hubs to get rid of your auto hubs in that case.

**57NAPCO** · 04-15-2018, 05:35 PM

Thanks! I’ll crawl under and look...after the snow melts.

**57NAPCO** · 04-18-2018, 04:11 PM

I have the 208 transfer case, Mile Marker does not make a conversion kit for this tcase. I can put manual hubs on it but the front shaft is still going to turn. (As per the tech at mile marker)

GSP7 · 04-18-2018, 07:07 PM

Quote:

Originally Posted by 57NAPCO

I have the 208 transfer case, Mile Marker does not make a conversion kit for this tcase. I can put manual hubs on it but the front shaft is still going to turn. (As per the tech at mile marker)

No ,,,, Hubs unlocked, 208 in 2 wd, not 4wd, the front drive shaft will not spine when you are driving....... Tech at milemarker is a Idiot

**57NAPCO** · 04-19-2018, 08:17 AM

Thanks, think I’ll just order mile marker hubs with the bolt kit (comments ?).
104 hubs with 1/2 ton nut conversation kit. $113.35
https://milemarker.com/product/104-hubs/

This truck stays in Maine and only driven in summer, not really a wheeler.

86454k30 · 04-20-2018, 07:23 PM

You don't need the nut kit either. Your hubs are auto locking not full time so unless they are bad they are fine.

**57NAPCO** · 04-21-2018, 10:19 AM

Just like school, I was never a good student but always eager to learn. Y’all are the teacher.

Thanks!

04-14-2018, 09:53 AM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,237	Those who have done MileMarker conversion... Are you happy with the results, cost and reliability? Thinking of doing the 502 kit in my 87 half ton. No garage up here in Maine but I have a driveway and I’m not afraid to use it https://milemarker.com/product/502-conversion-kit/

04-14-2018, 11:36 AM	#2
B. W. Registered User Join Date: Nov 2014 Location: Bigfork, Montana Posts: 1,137	Re: Those who have done MileMarker conversion... I worked for a company that had a fleet of GM trucks in the 70's & 80's. We converted every 203 we had. I can't remember ever having an issue with them. I believe they picked up fuel mileage but can't remember that either! (but what would that be? From 8 mpg to 10?) The trucks were loaded heavy & run hard. I don't remember the name of the conversion kits but they were similar in design. With that said, my DD is a 79 GMC K25. It still as the full time slugs in the axle but someone converted the T-case. (I'm guessing the PO took the lockout hubs with him) It has slop in the case when engaging 4wd & has gotten worse over the years. It's so bad now that I need to repair or replace it. This truck has been worked hard plowing & hauling cord wood.

04-15-2018, 10:03 AM	#3
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 982	Re: Those who have done MileMarker conversion... 87 wont have a 203 tcase. it should be a 208. all you need is manual hubs to get rid of your auto hubs in that case. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

04-15-2018, 05:35 PM	#4
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,237	Re: Those who have done MileMarker conversion... Thanks! I’ll crawl under and look...after the snow melts.

04-18-2018, 04:11 PM	#5
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,237	Re: Those who have done MileMarker conversion... I have the 208 transfer case, Mile Marker does not make a conversion kit for this tcase. I can put manual hubs on it but the front shaft is still going to turn. (As per the tech at mile marker)

04-19-2018, 08:17 AM	#7
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,237	Re: Those who have done MileMarker conversion... Thanks, think I’ll just order mile marker hubs with the bolt kit (comments ?). 104 hubs with 1/2 ton nut conversation kit. $113.35 https://milemarker.com/product/104-hubs/ This truck stays in Maine and only driven in summer, not really a wheeler.

04-20-2018, 07:23 PM	#8
86454k30 Registered User Join Date: May 2008 Location: Spokane, Washington Posts: 596	Re: Those who have done MileMarker conversion... You don't need the nut kit either. Your hubs are auto locking not full time so unless they are bad they are fine.

04-21-2018, 10:19 AM	#9
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,237	Re: Those who have done MileMarker conversion... Just like school, I was never a good student but always eager to learn. Y’all are the teacher. Thanks!



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