Richard Randale Jackson, federal prisoner # 12259-035, appeals the denial of his 18 U.S.C. § 3582(c)(2) motion for sentence modification pursuant to the Fair Sentencing Act and Amendment 750 to the Sentencing Guidelines. Jackson challenges the drug quantity determination that was made at his original sentencing. He also contends that the district court found at his original sentencing hearing that he was responsible for 1.5 kilograms of crack cocaine and that this quantity results in a reduction under the amended Guidelines. He relies upon United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), and Kimbrough v. United States, 552 U.S. 85, 128 S.Ct. 558, 169 L.Ed.2d 481 (2007), and contends that re-sentencing is warranted in his case due to the disparity in sentencing among offenses involving cocaine and crack cocaine.

Section 3582(c)(2) permits the discretionary modification of a defendant’s sentence “in the case of a defendant who has been sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission.” § 3582(c)(2); U.S.S.G. § lB1.10(a)(l) (2012). The district court’s decision whether to reduce a sentence under § 3582(c)(2) is reviewed for an abuse of discretion. United States v. Evans, 587 F.3d 667, 672 (5th Cir. 2009).

Jackson’s reliance on Booker and Kimbrough is misplaced, as § 3582(c)(2) only applies to amendments that result in lowering a defendant’s guidelines range. See Dillon v. United States, 560 U.S. 817, —, 130 S.Ct. 2683, 2691-94, 177 L.Ed.2d 271 (2010); § lB1.10(a)(2)(B). Moreover, the district court at sentencing determined that Jackson was responsible for more than 40 kilograms of cocaine base. Accordingly, Jackson’s base offense level of 38 is not modified by Amendment 750, because the amendment results in a base offense level of 38 for offenses involving “8.4 KG or more of Cocaine Base.” § 2Dl.l(c)(l) (2012). Jackson’s remaining arguments are simply an attempt to relitigate drug quantity. Issues that relate to original sentencing determinations may not be relitigated in a § 3582(c)(2) proceeding. Evans, 587 F.3d at 674.

AFFIRMED.