Shouldn't be a problem if you do the work and take your time.Just take more pics like you have,look at the videos for reference and the manual if need be. Don't forget the new armature plate and seals. I'd hate to tear back into one just for a warped plate.Same for the dealers when when they rebuild something, they have to stand behind their work. If he's just ordering parts he should know what to order for you.

 

So my dad accidently knocked my front differential and cracked the case all to hell so he's going to by me one he found one out of a 2012 ranges 500 crew for 450 dollars withh this fit in my 2007 sportsman 800 they look identical

 

Both early and late model gear cases appear to interchange with the 500 also.

Usage : 1332478

Year Product Model Assembly
2007 ATV SPORTSMAN 450 GEARCASE, FRONT (DEMAND DRIVE)(If Built Before 7/24/06) - A07MH46AA/AZ (49ATVTRANSINTL06SP500)
2007 ATV SPORTSMAN 500 EFI GEARCASE, FRONT (DEMAND DRIVE)(If Built Before 7/24/06) - A07MH50AL/AQ/AX/AY/AZ (49ATVTRANSINTL06SP500)
2007 ATV SPORTSMAN 500 EFI INTL GEARCASE, FRONT (DEMAND DRIVE)(If Built Before 7/24/06) - A07MH50FC (49ATVTRANSINTL06SP500)
2007 ATV SPORTSMAN 800 EFI GEARCASE, FRONT (DEMAND DRIVE)(If Built Before 7/24/06) - A07MH76AL/AQ/AX/AY/AZ (49ATVTRANSINTL06SP500)
2007 ATV SPORTSMAN 450 GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH46AA/AZ (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 500 EFI GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH50AB/AL/AQ/AX/AY/AZ (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 500 EFI INTL GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH50FC (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 800 EFI GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH76AL/AQ/AX/AY/AZ (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN X2 500 EFI GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07TH50AL/AQ/AU/AZ/TN50AF/AS/AU (49ATVGEARCASEMTG500EFI)
2006 ATV SPORTSMAN X2 HOUSING, FRONT MOUNTING (DEMAND DRIVE) - A06MN50AU/AW (4999204069920406D10)
2006 ATV SPORTSMAN X2 INTERNALS, FRONT HOUSING - A06MN50AU/AW (49ATVTRANSINTL06SP500)

Usage : 1332578

Year Product Model Assembly
2010 ATV SPORTSMAN TOURING 500 HO DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10DH50AX/AZ (49ATVGEARCASE08SP500)
2010 ATV SPORTSMAN TOURING 500 HO INTL DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10DH50FX (49ATVGEARCASE08SP500)
2010 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10MH50AJ/AX/AZ (49ATVGEARCASE08SP500)
2010 ATV SPORTSMAN 500 HO INTL DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10MH50FX/FF (49ATVGEARCASE08SP500)
2010 ATV SPORTSMAN 800 EFI DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10MH76AJ/MN76AX/AZ (49ATVGEARCASE08SP500)
2010 ATV SCRAMBLER 500 4X4 DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10NG50AA (49ATVGEARCASE08SP500)
2010 ATV SCRAMBLER 500 4X4 INTL DRIVE TRAIN, FRONT GEARCASE (Built 11/02/09 to 3/08/10) - A10NG50FA (49ATVGEARCASE08SP500)
2010 ATV SPORTSMAN TOURING 500 HO DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10DH50AX/AZ (49ATVGEARCASEMTG500EFI)
2010 ATV SPORTSMAN TOURING 500 HO INTL DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10DH50FX (49ATVGEARCASEMTG500EFI)
2010 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10MH50AJ/AX/AZ (49ATVGEARCASEMTG500EFI)
2010 ATV SPORTSMAN 500 HO INTL DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10MH50FX/FF (49ATVGEARCASEMTG500EFI)
2010 ATV SPORTSMAN 800 EFI DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10MH76AJ/MN76AX/AZ (49ATVGEARCASEMTG500EFI)
2010 ATV SCRAMBLER 500 4X4 DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10NG50AA (49ATVGEARCASEMTG10SCRAM)
2010 ATV SCRAMBLER 500 4X4 INTL DRIVE TRAIN, FRONT GEARCASE MOUNTING - A10NG50FA (49ATVGEARCASEMTG10SCRAM)
2010 MIL MILITARY SPORTSMAN 700 DRIVE TRAIN, FRONT GEARCASE (Built 3/08/10 and Before) - M10MH68MA/MV (49ATVGEARCASE08SP500)
2010 MIL MILITARY SPORTSMAN 700 DRIVE TRAIN, GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - M10MH68MA/MV (49ATVGEARCASEMTG500EFI)
2009 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE (Built 4/13/09 and Before) - A09MH50AS/AX/AZ (49ATVGEARCASE08SP500)
2009 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE MOUNTING - A09MH50AS/AX/AZ (49ATVGEARCASEMTG500EFI)
2009 MIL SPORTSMAN 500 HO MILITARY TACOM DRIVE TRAIN, FRONT GEARCASE - M09MH50MX (49ATVGEARCASE08SP500)
2009 MIL SPORTSMAN 500 HO MILITARY TACOM DRIVE TRAIN, FRONT GEARCASE MOUNTING - M09MH50MX (49ATVGEARCASEMTG500EFI)
2008 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE - A08MH50AX/AZ (49ATVGEARCASE08SP500)
2008 ATV SPORTSMAN 500 HO DRIVE TRAIN, FRONT GEARCASE MOUNTING - A08MH50AX/AZ (49ATVGEARCASEMTG500EFI)
2008 MIL SPORTSMAN 800 HO EFI MILITARY DRIVE TRAIN, FRONT GEARCASE - M08MH76MA/MB (49ATVGEARCASE08SP500)
2008 MIL SPORTSMAN 800 HO EFI MILITARY DRIVE TRAIN, FRONT GEARCASE MOUNTING - M08MH76MA/MB (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 450 GEARCASE, FRONT (If Built After 7/24/06) - A07MH46AA/AZ (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN 500 EFI GEARCASE, FRONT (If Built After 7/24/06) - A07MH50AB/AL/AQ/AX/AY/AZ (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN 500 EFI INTL GEARCASE, FRONT (If Built After 7/24/06) - A07MH50FC (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN 800 EFI GEARCASE, FRONT (If Built After 7/24/06) - A07MH76AL/AQ/AX/AY/AZ/A2 (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN 800 EFI INTL GEARCASE, FRONT - A07MH76FA (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN X2 500 EFI GEARCASE, FRONT - A07TH50AL/AQ/AU/AZ (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN X2 500 EFI QUAD GEARCASE, FRONT - A07TH50EA (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN X2 800 EFI GEARCASE, FRONT - A07TH76AU (49ATVGEARCASE08SP500)
2007 ATV SPORTSMAN 500 EFI GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH50AB/AL/AQ/AX/AY/AZ (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 500 EFI INTL GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH50FC (49ATVGEARCASEMTG500EFI)
2007 ATV SPORTSMAN 800 EFI GEARCASE, MOUNTING, FRONT (DEMAND DRIVE) - A07MH76AL/AQ/AX/AY/AZ (49ATVGEARCASEMTG500EFI)

The quads gear cases will interchange and pretty sure one out of a Ranger will also. Main thing is the splines on the output shafts in the 2012 gear case match your 2007 drive shafts. Can't say for sure,but they should.

 

Well I guess I'll have to try hopefully it works

 

When things like this break I like to take them apart and see how they work and stuff can you tell me on this from diff what wires are positive and negative there is a brown and grey wire

 

Brown is always ground on Polaris. Grey is the hot wire.

 

Thank you very much